docs: def has_frames(self, destination):
          """
          Whether specified queue has any frames.
  
          @param destination: The queue name (destinationination).
          @type destination: C{str}
  
          @return: Whether there are any frames in the specified queue.
          @rtype: C{bool}
          """
          return (destination in self.queue_metadata) and bool(self.queue_metadata[destination]['frames'])