docs: def as_single_element(self):
          """
          Processes the response as a single-element response,
          like config_get or system_counters_get.
          If there is more then one element in the response or no
          elements this raises a ResponseError
          """
          if self.as_return_etree is None:
              return None
          if len(self.as_return_etree.getchildren()) == 1:
              return _populate_bunch_with_element(self.as_return_etree.
                                                  getchildren()[0])
          return _populate_bunch_with_element(self.as_return_etree)