code: def nx_ensure_agraph_color(graph):
      from plottool import color_funcs
      import plottool as pt
      def _fix_agraph_color(data):
          try:
              orig_color = data.get('color', None)
              alpha = data.get('alpha', None)
              color = orig_color
              if color is None and alpha is not None:
                  color = [0, 0, 0]
              if color is not None:
                  color = pt.ensure_nonhex_color(color)
                  color = list(color_funcs.ensure_base255(color))
                  if alpha is not None:
                      if len(color) == 3:
                          color += [int(alpha * 255)]
                      else:
                          color[3] = int(alpha * 255)
                  color = tuple(color)
                  if len(color) == 3:
                      data['color'] = '
                  else:
                      data['color'] = '
          except Exception as ex:
              import utool as ut
              ut.printex(ex, keys=['color', 'orig_color', 'data'])
              raise
      for node, node_data in graph.nodes(data=True):
          data = node_data
          _fix_agraph_color(data)
      for u, v, edge_data in graph.edges(data=True):
          data = edge_data
          _fix_agraph_color(data)