We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
awx.awx.group option preserve hosts fails when there are no hosts.
### Please confirm the following

- [X] I agree to follow this project's [code of conduct](https://docs.ansible.com/ansible/latest/community/code_of_conduct.html).
- [X] I have checked the [current issues](https://github.com/ansible/awx/issues) for duplicates.
- [X] I understand that AWX is open source software provided for free and that I might not receive a timely response.

### Summary

when using awx.awx.groups the preserve hosts/groups options fails if there are no groups/hosts.




### AWX version

19.4.0

### Select the relevant components

- [ ] UI
- [ ] API
- [ ] Docs

### Installation method

minikube

### Modifications

no

### Ansible version

_No response_

### Operating system

_No response_

### Web browser

_No response_

### Steps to reproduce

```
    - name: Add host to temporary group for new vms
      awx.awx.group:
        name: new_vms
        inventory: "Temporary Inventory"
        hosts:
          - "{{ name }}"
        validate_certs: false
        preserve_existing_hosts: True
      when:
        - use_aap_inventory
        - vm is succeeded
```

### Expected results

It runs and adds the host to the empty group

### Actual results

```
TypeError: 'NoneType' object is not subscriptabl
```

### Additional information

Because [This line](https://github.com/ansible/awx/blob/593eebf062cd1f73c117502e0491f3c8532695a3/awx_collection/plugins/modules/group.py#L174) returns NoneType when there are no hosts in the group.

module needs to be updated to fix this issue.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `awx_collection/plugins/modules/group.py`
Content:
```
1 #!/usr/bin/python
2 # coding: utf-8 -*-
3 
4 # (c) 2017, Wayne Witzel III <wayne@riotousliving.com>
5 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
6 
7 from __future__ import absolute_import, division, print_function
8 
9 __metaclass__ = type
10 
11 
12 ANSIBLE_METADATA = {'metadata_version': '1.1', 'status': ['preview'], 'supported_by': 'community'}
13 
14 
15 DOCUMENTATION = '''
16 ---
17 module: group
18 author: "Wayne Witzel III (@wwitzel3)"
19 short_description: create, update, or destroy Automation Platform Controller group.
20 description:
21     - Create, update, or destroy Automation Platform Controller groups. See
22       U(https://www.ansible.com/tower) for an overview.
23 options:
24     name:
25       description:
26         - The name to use for the group.
27       required: True
28       type: str
29     description:
30       description:
31         - The description to use for the group.
32       type: str
33     inventory:
34       description:
35         - Inventory the group should be made a member of.
36       required: True
37       type: str
38     variables:
39       description:
40         - Variables to use for the group.
41       type: dict
42     hosts:
43       description:
44         - List of hosts that should be put in this group.
45       type: list
46       elements: str
47     children:
48       description:
49         - List of groups that should be nested inside in this group.
50       type: list
51       elements: str
52       aliases:
53         - groups
54     preserve_existing_hosts:
55       description:
56         - Provide option (False by default) to preserves existing hosts in an existing group.
57       default: False
58       type: bool
59     preserve_existing_children:
60       description:
61         - Provide option (False by default) to preserves existing children in an existing group.
62       default: False
63       type: bool
64       aliases:
65         - preserve_existing_groups
66     state:
67       description:
68         - Desired state of the resource.
69       default: "present"
70       choices: ["present", "absent", "exists"]
71       type: str
72     new_name:
73       description:
74         - A new name for this group (for renaming)
75       type: str
76 extends_documentation_fragment: awx.awx.auth
77 '''
78 
79 
80 EXAMPLES = '''
81 - name: Add group
82   group:
83     name: localhost
84     description: "Local Host Group"
85     inventory: "Local Inventory"
86     state: present
87     controller_config_file: "~/tower_cli.cfg"
88 
89 - name: Add group
90   group:
91     name: Cities
92     description: "Local Host Group"
93     inventory: Default Inventory
94     hosts:
95       - fda
96     children:
97       - NewYork
98     preserve_existing_hosts: True
99     preserve_existing_children: True
100 '''
101 
102 from ..module_utils.controller_api import ControllerAPIModule
103 import json
104 
105 
106 def main():
107     # Any additional arguments that are not fields of the item can be added here
108     argument_spec = dict(
109         name=dict(required=True),
110         new_name=dict(),
111         description=dict(),
112         inventory=dict(required=True),
113         variables=dict(type='dict'),
114         hosts=dict(type='list', elements='str'),
115         children=dict(type='list', elements='str', aliases=['groups']),
116         preserve_existing_hosts=dict(type='bool', default=False),
117         preserve_existing_children=dict(type='bool', default=False, aliases=['preserve_existing_groups']),
118         state=dict(choices=['present', 'absent', 'exists'], default='present'),
119     )
120 
121     # Create a module for ourselves
122     module = ControllerAPIModule(argument_spec=argument_spec)
123 
124     # Extract our parameters
125     name = module.params.get('name')
126     new_name = module.params.get('new_name')
127     inventory = module.params.get('inventory')
128     description = module.params.get('description')
129     state = module.params.pop('state')
130     preserve_existing_hosts = module.params.get('preserve_existing_hosts')
131     preserve_existing_children = module.params.get('preserve_existing_children')
132     variables = module.params.get('variables')
133 
134     # Attempt to look up the related items the user specified (these will fail the module if not found)
135     inventory_id = module.resolve_name_to_id('inventories', inventory)
136 
137     # Attempt to look up the object based on the provided name and inventory ID
138     group = module.get_one('groups', name_or_id=name, check_exists=(state == 'exists'), **{'data': {'inventory': inventory_id}})
139 
140     if state == 'absent':
141         # If the state was absent we can let the module delete it if needed, the module will handle exiting from this
142         module.delete_if_needed(group)
143 
144     # Create the data that gets sent for create and update
145     group_fields = {
146         'name': new_name if new_name else (module.get_item_name(group) if group else name),
147         'inventory': inventory_id,
148     }
149     if description is not None:
150         group_fields['description'] = description
151     if variables is not None:
152         group_fields['variables'] = json.dumps(variables)
153 
154     association_fields = {}
155     for resource, relationship in (('hosts', 'hosts'), ('groups', 'children')):
156         name_list = module.params.get(relationship)
157         if name_list is None:
158             continue
159         id_list = []
160         for sub_name in name_list:
161             sub_obj = module.get_one(
162                 resource,
163                 name_or_id=sub_name,
164                 **{
165                     'data': {'inventory': inventory_id},
166                 }
167             )
168             if sub_obj is None:
169                 module.fail_json(msg='Could not find {0} with name {1}'.format(resource, sub_name))
170             id_list.append(sub_obj['id'])
171         # Preserve existing objects
172         if (preserve_existing_hosts and relationship == 'hosts') or (preserve_existing_children and relationship == 'children'):
173             preserve_existing_check = module.get_all_endpoint(group['related'][relationship])
174             for sub_obj in preserve_existing_check['json']['results']:
175                 id_list.append(sub_obj['id'])
176         if id_list:
177             association_fields[relationship] = id_list
178 
179     # If the state was present we can let the module build or update the existing group, this will return on its own
180     module.create_or_update_if_needed(group, group_fields, endpoint='groups', item_type='group', associations=association_fields)
181 
182 
183 if __name__ == '__main__':
184     main()
185
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/awx_collection/plugins/modules/group.py b/awx_collection/plugins/modules/group.py
--- a/awx_collection/plugins/modules/group.py
+++ b/awx_collection/plugins/modules/group.py
@@ -170,9 +170,11 @@
             id_list.append(sub_obj['id'])
         # Preserve existing objects
         if (preserve_existing_hosts and relationship == 'hosts') or (preserve_existing_children and relationship == 'children'):
-            preserve_existing_check = module.get_all_endpoint(group['related'][relationship])
-            for sub_obj in preserve_existing_check['json']['results']:
-                id_list.append(sub_obj['id'])
+            if group:
+                preserve_existing_check = module.get_all_endpoint(group['related'][relationship])
+                for sub_obj in preserve_existing_check['json']['results']:
+                    if 'id' in sub_obj:
+                        id_list.append(sub_obj['id'])
         if id_list:
             association_fields[relationship] = id_list

{"golden_diff": "diff --git a/awx_collection/plugins/modules/group.py b/awx_collection/plugins/modules/group.py\n--- a/awx_collection/plugins/modules/group.py\n+++ b/awx_collection/plugins/modules/group.py\n@@ -170,9 +170,11 @@\n             id_list.append(sub_obj['id'])\n         # Preserve existing objects\n         if (preserve_existing_hosts and relationship == 'hosts') or (preserve_existing_children and relationship == 'children'):\n-            preserve_existing_check = module.get_all_endpoint(group['related'][relationship])\n-            for sub_obj in preserve_existing_check['json']['results']:\n-                id_list.append(sub_obj['id'])\n+            if group:\n+                preserve_existing_check = module.get_all_endpoint(group['related'][relationship])\n+                for sub_obj in preserve_existing_check['json']['results']:\n+                    if 'id' in sub_obj:\n+                        id_list.append(sub_obj['id'])\n         if id_list:\n             association_fields[relationship] = id_list\n", "issue": "awx.awx.group option preserve hosts fails when there are no hosts.\n### Please confirm the following\n\n- [X] I agree to follow this project's [code of conduct](https://docs.ansible.com/ansible/latest/community/code_of_conduct.html).\n- [X] I have checked the [current issues](https://github.com/ansible/awx/issues) for duplicates.\n- [X] I understand that AWX is open source software provided for free and that I might not receive a timely response.\n\n### Summary\n\nwhen using awx.awx.groups the preserve hosts/groups options fails if there are no groups/hosts.\r\n\r\n\r\n\n\n### AWX version\n\n19.4.0\n\n### Select the relevant components\n\n- [ ] UI\n- [ ] API\n- [ ] Docs\n\n### Installation method\n\nminikube\n\n### Modifications\n\nno\n\n### Ansible version\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Web browser\n\n_No response_\n\n### Steps to reproduce\n\n```\r\n    - name: Add host to temporary group for new vms\r\n      awx.awx.group:\r\n        name: new_vms\r\n        inventory: \"Temporary Inventory\"\r\n        hosts:\r\n          - \"{{ name }}\"\r\n        validate_certs: false\r\n        preserve_existing_hosts: True\r\n      when:\r\n        - use_aap_inventory\r\n        - vm is succeeded\r\n```\n\n### Expected results\n\nIt runs and adds the host to the empty group\n\n### Actual results\n\n```\r\nTypeError: 'NoneType' object is not subscriptabl\r\n```\n\n### Additional information\n\nBecause [This line](https://github.com/ansible/awx/blob/593eebf062cd1f73c117502e0491f3c8532695a3/awx_collection/plugins/modules/group.py#L174) returns NoneType when there are no hosts in the group.\r\n\r\nmodule needs to be updated to fix this issue.\n", "before_files": [{"content": "#!/usr/bin/python\n# coding: utf-8 -*-\n\n# (c) 2017, Wayne Witzel III <wayne@riotousliving.com>\n# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)\n\nfrom __future__ import absolute_import, division, print_function\n\n__metaclass__ = type\n\n\nANSIBLE_METADATA = {'metadata_version': '1.1', 'status': ['preview'], 'supported_by': 'community'}\n\n\nDOCUMENTATION = '''\n---\nmodule: group\nauthor: \"Wayne Witzel III (@wwitzel3)\"\nshort_description: create, update, or destroy Automation Platform Controller group.\ndescription:\n    - Create, update, or destroy Automation Platform Controller groups. See\n      U(https://www.ansible.com/tower) for an overview.\noptions:\n    name:\n      description:\n        - The name to use for the group.\n      required: True\n      type: str\n    description:\n      description:\n        - The description to use for the group.\n      type: str\n    inventory:\n      description:\n        - Inventory the group should be made a member of.\n      required: True\n      type: str\n    variables:\n      description:\n        - Variables to use for the group.\n      type: dict\n    hosts:\n      description:\n        - List of hosts that should be put in this group.\n      type: list\n      elements: str\n    children:\n      description:\n        - List of groups that should be nested inside in this group.\n      type: list\n      elements: str\n      aliases:\n        - groups\n    preserve_existing_hosts:\n      description:\n        - Provide option (False by default) to preserves existing hosts in an existing group.\n      default: False\n      type: bool\n    preserve_existing_children:\n      description:\n        - Provide option (False by default) to preserves existing children in an existing group.\n      default: False\n      type: bool\n      aliases:\n        - preserve_existing_groups\n    state:\n      description:\n        - Desired state of the resource.\n      default: \"present\"\n      choices: [\"present\", \"absent\", \"exists\"]\n      type: str\n    new_name:\n      description:\n        - A new name for this group (for renaming)\n      type: str\nextends_documentation_fragment: awx.awx.auth\n'''\n\n\nEXAMPLES = '''\n- name: Add group\n  group:\n    name: localhost\n    description: \"Local Host Group\"\n    inventory: \"Local Inventory\"\n    state: present\n    controller_config_file: \"~/tower_cli.cfg\"\n\n- name: Add group\n  group:\n    name: Cities\n    description: \"Local Host Group\"\n    inventory: Default Inventory\n    hosts:\n      - fda\n    children:\n      - NewYork\n    preserve_existing_hosts: True\n    preserve_existing_children: True\n'''\n\nfrom ..module_utils.controller_api import ControllerAPIModule\nimport json\n\n\ndef main():\n    # Any additional arguments that are not fields of the item can be added here\n    argument_spec = dict(\n        name=dict(required=True),\n        new_name=dict(),\n        description=dict(),\n        inventory=dict(required=True),\n        variables=dict(type='dict'),\n        hosts=dict(type='list', elements='str'),\n        children=dict(type='list', elements='str', aliases=['groups']),\n        preserve_existing_hosts=dict(type='bool', default=False),\n        preserve_existing_children=dict(type='bool', default=False, aliases=['preserve_existing_groups']),\n        state=dict(choices=['present', 'absent', 'exists'], default='present'),\n    )\n\n    # Create a module for ourselves\n    module = ControllerAPIModule(argument_spec=argument_spec)\n\n    # Extract our parameters\n    name = module.params.get('name')\n    new_name = module.params.get('new_name')\n    inventory = module.params.get('inventory')\n    description = module.params.get('description')\n    state = module.params.pop('state')\n    preserve_existing_hosts = module.params.get('preserve_existing_hosts')\n    preserve_existing_children = module.params.get('preserve_existing_children')\n    variables = module.params.get('variables')\n\n    # Attempt to look up the related items the user specified (these will fail the module if not found)\n    inventory_id = module.resolve_name_to_id('inventories', inventory)\n\n    # Attempt to look up the object based on the provided name and inventory ID\n    group = module.get_one('groups', name_or_id=name, check_exists=(state == 'exists'), **{'data': {'inventory': inventory_id}})\n\n    if state == 'absent':\n        # If the state was absent we can let the module delete it if needed, the module will handle exiting from this\n        module.delete_if_needed(group)\n\n    # Create the data that gets sent for create and update\n    group_fields = {\n        'name': new_name if new_name else (module.get_item_name(group) if group else name),\n        'inventory': inventory_id,\n    }\n    if description is not None:\n        group_fields['description'] = description\n    if variables is not None:\n        group_fields['variables'] = json.dumps(variables)\n\n    association_fields = {}\n    for resource, relationship in (('hosts', 'hosts'), ('groups', 'children')):\n        name_list = module.params.get(relationship)\n        if name_list is None:\n            continue\n        id_list = []\n        for sub_name in name_list:\n            sub_obj = module.get_one(\n                resource,\n                name_or_id=sub_name,\n                **{\n                    'data': {'inventory': inventory_id},\n                }\n            )\n            if sub_obj is None:\n                module.fail_json(msg='Could not find {0} with name {1}'.format(resource, sub_name))\n            id_list.append(sub_obj['id'])\n        # Preserve existing objects\n        if (preserve_existing_hosts and relationship == 'hosts') or (preserve_existing_children and relationship == 'children'):\n            preserve_existing_check = module.get_all_endpoint(group['related'][relationship])\n            for sub_obj in preserve_existing_check['json']['results']:\n                id_list.append(sub_obj['id'])\n        if id_list:\n            association_fields[relationship] = id_list\n\n    # If the state was present we can let the module build or update the existing group, this will return on its own\n    module.create_or_update_if_needed(group, group_fields, endpoint='groups', item_type='group', associations=association_fields)\n\n\nif __name__ == '__main__':\n    main()\n", "path": "awx_collection/plugins/modules/group.py"}], "after_files": [{"content": "#!/usr/bin/python\n# coding: utf-8 -*-\n\n# (c) 2017, Wayne Witzel III <wayne@riotousliving.com>\n# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)\n\nfrom __future__ import absolute_import, division, print_function\n\n__metaclass__ = type\n\n\nANSIBLE_METADATA = {'metadata_version': '1.1', 'status': ['preview'], 'supported_by': 'community'}\n\n\nDOCUMENTATION = '''\n---\nmodule: group\nauthor: \"Wayne Witzel III (@wwitzel3)\"\nshort_description: create, update, or destroy Automation Platform Controller group.\ndescription:\n    - Create, update, or destroy Automation Platform Controller groups. See\n      U(https://www.ansible.com/tower) for an overview.\noptions:\n    name:\n      description:\n        - The name to use for the group.\n      required: True\n      type: str\n    description:\n      description:\n        - The description to use for the group.\n      type: str\n    inventory:\n      description:\n        - Inventory the group should be made a member of.\n      required: True\n      type: str\n    variables:\n      description:\n        - Variables to use for the group.\n      type: dict\n    hosts:\n      description:\n        - List of hosts that should be put in this group.\n      type: list\n      elements: str\n    children:\n      description:\n        - List of groups that should be nested inside in this group.\n      type: list\n      elements: str\n      aliases:\n        - groups\n    preserve_existing_hosts:\n      description:\n        - Provide option (False by default) to preserves existing hosts in an existing group.\n      default: False\n      type: bool\n    preserve_existing_children:\n      description:\n        - Provide option (False by default) to preserves existing children in an existing group.\n      default: False\n      type: bool\n      aliases:\n        - preserve_existing_groups\n    state:\n      description:\n        - Desired state of the resource.\n      default: \"present\"\n      choices: [\"present\", \"absent\", \"exists\"]\n      type: str\n    new_name:\n      description:\n        - A new name for this group (for renaming)\n      type: str\nextends_documentation_fragment: awx.awx.auth\n'''\n\n\nEXAMPLES = '''\n- name: Add group\n  group:\n    name: localhost\n    description: \"Local Host Group\"\n    inventory: \"Local Inventory\"\n    state: present\n    controller_config_file: \"~/tower_cli.cfg\"\n\n- name: Add group\n  group:\n    name: Cities\n    description: \"Local Host Group\"\n    inventory: Default Inventory\n    hosts:\n      - fda\n    children:\n      - NewYork\n    preserve_existing_hosts: True\n    preserve_existing_children: True\n'''\n\nfrom ..module_utils.controller_api import ControllerAPIModule\nimport json\n\n\ndef main():\n    # Any additional arguments that are not fields of the item can be added here\n    argument_spec = dict(\n        name=dict(required=True),\n        new_name=dict(),\n        description=dict(),\n        inventory=dict(required=True),\n        variables=dict(type='dict'),\n        hosts=dict(type='list', elements='str'),\n        children=dict(type='list', elements='str', aliases=['groups']),\n        preserve_existing_hosts=dict(type='bool', default=False),\n        preserve_existing_children=dict(type='bool', default=False, aliases=['preserve_existing_groups']),\n        state=dict(choices=['present', 'absent', 'exists'], default='present'),\n    )\n\n    # Create a module for ourselves\n    module = ControllerAPIModule(argument_spec=argument_spec)\n\n    # Extract our parameters\n    name = module.params.get('name')\n    new_name = module.params.get('new_name')\n    inventory = module.params.get('inventory')\n    description = module.params.get('description')\n    state = module.params.pop('state')\n    preserve_existing_hosts = module.params.get('preserve_existing_hosts')\n    preserve_existing_children = module.params.get('preserve_existing_children')\n    variables = module.params.get('variables')\n\n    # Attempt to look up the related items the user specified (these will fail the module if not found)\n    inventory_id = module.resolve_name_to_id('inventories', inventory)\n\n    # Attempt to look up the object based on the provided name and inventory ID\n    group = module.get_one('groups', name_or_id=name, check_exists=(state == 'exists'), **{'data': {'inventory': inventory_id}})\n\n    if state == 'absent':\n        # If the state was absent we can let the module delete it if needed, the module will handle exiting from this\n        module.delete_if_needed(group)\n\n    # Create the data that gets sent for create and update\n    group_fields = {\n        'name': new_name if new_name else (module.get_item_name(group) if group else name),\n        'inventory': inventory_id,\n    }\n    if description is not None:\n        group_fields['description'] = description\n    if variables is not None:\n        group_fields['variables'] = json.dumps(variables)\n\n    association_fields = {}\n    for resource, relationship in (('hosts', 'hosts'), ('groups', 'children')):\n        name_list = module.params.get(relationship)\n        if name_list is None:\n            continue\n        id_list = []\n        for sub_name in name_list:\n            sub_obj = module.get_one(\n                resource,\n                name_or_id=sub_name,\n                **{\n                    'data': {'inventory': inventory_id},\n                }\n            )\n            if sub_obj is None:\n                module.fail_json(msg='Could not find {0} with name {1}'.format(resource, sub_name))\n            id_list.append(sub_obj['id'])\n        # Preserve existing objects\n        if (preserve_existing_hosts and relationship == 'hosts') or (preserve_existing_children and relationship == 'children'):\n            if group:\n                preserve_existing_check = module.get_all_endpoint(group['related'][relationship])\n                for sub_obj in preserve_existing_check['json']['results']:\n                    if 'id' in sub_obj:\n                        id_list.append(sub_obj['id'])\n        if id_list:\n            association_fields[relationship] = id_list\n\n    # If the state was present we can let the module build or update the existing group, this will return on its own\n    module.create_or_update_if_needed(group, group_fields, endpoint='groups', item_type='group', associations=association_fields)\n\n\nif __name__ == '__main__':\n    main()\n", "path": "awx_collection/plugins/modules/group.py"}]}