We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
mail_password form crashes if user is not found
Visiting /mali_password without providing a userid will simply crash. And if mail_password_form is submitted and a user is not found, or the user doesn't have an email configured, it will crash as well.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `Products/CMFPlone/browser/login/mail_password.py`
Content:
```
1 # -*- coding: utf-8 -*-
2 from AccessControl import Unauthorized
3 from Products.CMFPlone import PloneMessageFactory as _
4 from Products.Five import BrowserView
5 from Products.statusmessages.interfaces import IStatusMessage
6 
7 
8 class MailPasswordView(BrowserView):
9 
10     def __call__(self):
11         try:
12             response = self.context.portal_registration.mailPassword(
13                 self.request.form.get('userid', ''),
14                 self.request,
15             )
16         except ValueError as e:
17             try:
18                 msg = _(str(e))
19             except Unauthorized:
20                 # If we are not allowed to tell the user, what is wrong, he
21                 # should get an error message and contact the admins
22                 raise e
23             IStatusMessage(self.request).add(msg)
24             self.request.response.redirect(
25                 self.context.absolute_url() + 'mail_password_form'
26             )
27         return response
28
```
--- 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/Products/CMFPlone/browser/login/mail_password.py b/Products/CMFPlone/browser/login/mail_password.py
--- a/Products/CMFPlone/browser/login/mail_password.py
+++ b/Products/CMFPlone/browser/login/mail_password.py
@@ -8,6 +8,7 @@
 class MailPasswordView(BrowserView):
 
     def __call__(self):
+        response = None
         try:
             response = self.context.portal_registration.mailPassword(
                 self.request.form.get('userid', ''),
@@ -22,6 +23,6 @@
                 raise e
             IStatusMessage(self.request).add(msg)
             self.request.response.redirect(
-                self.context.absolute_url() + 'mail_password_form'
+                self.context.absolute_url() + '/mail_password_form'
             )
         return response

{"golden_diff": "diff --git a/Products/CMFPlone/browser/login/mail_password.py b/Products/CMFPlone/browser/login/mail_password.py\n--- a/Products/CMFPlone/browser/login/mail_password.py\n+++ b/Products/CMFPlone/browser/login/mail_password.py\n@@ -8,6 +8,7 @@\n class MailPasswordView(BrowserView):\n \n     def __call__(self):\n+        response = None\n         try:\n             response = self.context.portal_registration.mailPassword(\n                 self.request.form.get('userid', ''),\n@@ -22,6 +23,6 @@\n                 raise e\n             IStatusMessage(self.request).add(msg)\n             self.request.response.redirect(\n-                self.context.absolute_url() + 'mail_password_form'\n+                self.context.absolute_url() + '/mail_password_form'\n             )\n         return response\n", "issue": "mail_password form crashes if user is not found\nVisiting /mali_password without providing a userid will simply crash. And if mail_password_form is submitted and a user is not found, or the user doesn't have an email configured, it will crash as well.\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\nfrom AccessControl import Unauthorized\nfrom Products.CMFPlone import PloneMessageFactory as _\nfrom Products.Five import BrowserView\nfrom Products.statusmessages.interfaces import IStatusMessage\n\n\nclass MailPasswordView(BrowserView):\n\n    def __call__(self):\n        try:\n            response = self.context.portal_registration.mailPassword(\n                self.request.form.get('userid', ''),\n                self.request,\n            )\n        except ValueError as e:\n            try:\n                msg = _(str(e))\n            except Unauthorized:\n                # If we are not allowed to tell the user, what is wrong, he\n                # should get an error message and contact the admins\n                raise e\n            IStatusMessage(self.request).add(msg)\n            self.request.response.redirect(\n                self.context.absolute_url() + 'mail_password_form'\n            )\n        return response\n", "path": "Products/CMFPlone/browser/login/mail_password.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\nfrom AccessControl import Unauthorized\nfrom Products.CMFPlone import PloneMessageFactory as _\nfrom Products.Five import BrowserView\nfrom Products.statusmessages.interfaces import IStatusMessage\n\n\nclass MailPasswordView(BrowserView):\n\n    def __call__(self):\n        response = None\n        try:\n            response = self.context.portal_registration.mailPassword(\n                self.request.form.get('userid', ''),\n                self.request,\n            )\n        except ValueError as e:\n            try:\n                msg = _(str(e))\n            except Unauthorized:\n                # If we are not allowed to tell the user, what is wrong, he\n                # should get an error message and contact the admins\n                raise e\n            IStatusMessage(self.request).add(msg)\n            self.request.response.redirect(\n                self.context.absolute_url() + '/mail_password_form'\n            )\n        return response\n", "path": "Products/CMFPlone/browser/login/mail_password.py"}]}