code: def group_plugins_into_categories(plugins):
      
      if not plugins:
          return {}
      plugins = sorted(plugins, key=lambda p: p.verbose_name)
      categories = {}
  
      for plugin in plugins:
          title = str(plugin.category or u"")  # enforce resolving ugettext_lazy proxies.
          if title not in categories:
              categories[title] = []
          categories[title].append(plugin)
  
      return categories
docs: Return all plugins, grouped by category.
      The structure is a {"Categorynane": [list of plugin classes]}