docs: def fill_response_property(xml_root, name=None, value=None):
      """Returns response property and fills it if missing."""
      name, value = generate_response_property(name, value)
      response_property = None
  
      if xml_root.tag == "testsuites":
          response_property = _fill_testsuites_response_property(xml_root, name, value)
      elif xml_root.tag in ("testcases", "requirements"):
          response_property = _fill_non_testsuites_response_property(xml_root, name, value)
      else:
          raise Dump2PolarionException(_NOT_EXPECTED_FORMAT_MSG)
  
      return response_property