code: def get_inconsistent_fieldnames():
      
      field_name_list = []
      for fieldset_title, fields_list in settings.CONFIG_FIELDSETS.items():
          for field_name in fields_list:
              field_name_list.append(field_name)
      if not field_name_list:
          return {}
      return set(set(settings.CONFIG.keys()) - set(field_name_list))
docs: Returns a set of keys from settings.CONFIG that are not accounted for in
      settings.CONFIG_FIELDSETS.
      If there are no fieldnames in settings.CONFIG_FIELDSETS, returns an empty set.