code: def _unregister_service(self):
          
          if self._registration is not None:
              # Ignore error
              try:
                  self._registration.unregister()
              except BundleException as ex:
                  # Only log the error at this level
                  logger = logging.getLogger(
                      "-".join((self._ipopo_instance.name, "ServiceRegistration"))
                  )
                  logger.error("Error unregistering a service: %s", ex)
  
              # Notify the component (even in case of error)
              self._ipopo_instance.safe_callback(
                  ipopo_constants.IPOPO_CALLBACK_POST_UNREGISTRATION,
                  self._svc_reference,
              )
  
              self._registration = None
              self._svc_reference = None
docs: Unregisters the provided service, if needed