docs: def find_routing_area(ra_id=None, ra_name=None):
          """
          find routing area according routing area id (default) or routing area name
          :param ra_id: routing area id
          :param ra_name: routing area name
          :return: found routing area or None
          """
          LOGGER.debug("RoutingAreaService.find_routing_area")
          if (ra_id is None or not ra_id) and (ra_name is None or not ra_name):
              raise exceptions.ArianeCallParametersError('id and name')
  
          if (ra_id is not None and ra_id) and (ra_name is not None and ra_name):
              LOGGER.warn('RoutingAreaService.find_routing_area - Both id and name are defined. '
                          'Will give you search on id.')
              ra_name = None
  
          params = None
          if ra_id is not None and ra_id:
              params = {'id': ra_id}
          elif ra_name is not None and ra_name:
              params = {'name': ra_name}
  
          ret = None
          if params is not None:
              args = {'http_operation': 'GET', 'operation_path': 'get', 'parameters': params}
              response = RoutingAreaService.requester.call(args)
              if response.rc == 0:
                  ret = RoutingArea.json_2_routing_area(response.response_content)
              elif response.rc != 404:
                  err_msg = 'RoutingAreaService.find_routing_area - Problem while finding routing area (id:' + \
                            str(ra_id) + ', name:' + str(ra_name) + '). ' + \
                            'Reason: ' + str(response.response_content) + '-' + str(response.error_message) + \
                            " (" + str(response.rc) + ")"
                  LOGGER.warning(
                      err_msg
                  )
  
          return ret