docs: def on_execute__set_video_config(self, request):
          '''
          .. versionchanged:: 0.12
              Accept empty video configuration as either `None` or an empty
              `pandas.Series`.
          '''
          data = decode_content_data(request)
          compare_fields = ['device_name', 'width', 'height', 'name', 'fourcc',
                            'framerate']
          if data['video_config'] is None or not data['video_config'].shape[0]:
              i = None
          else:
              for i, row in self.parent.video_mode_slave.configs.iterrows():
                  if (row[compare_fields] ==
                          data['video_config'][compare_fields]).all():
                      break
              else:
                  i = None
          if i is None:
              logger.error('Unsupported video config:\n%s', data['video_config'])
              logger.error('Video configs:\n%s',
                           self.parent.video_mode_slave.configs)
              self.parent.video_mode_slave.config_combo.set_active(0)
          else:
              logger.error('Set video config (%d):\n%s', i + 1,
                           data['video_config'])
              self.parent.video_mode_slave.config_combo.set_active(i + 1)