code: @Override
  	public Collection<String> removeSessionToTopics(Session session) {
  		if (session != null) {
  			return removeSessionsToTopic(Arrays.asList(session));
  //			for (String topic : map.keySet()) {
  //				sendSubscriptionEvent(Constants.Topic.SUBSCRIBERS + Constants.Topic.COLON + topic, unregisterTopicSession(topic, session));
  //			}
  		}
  		return Collections.EMPTY_LIST;
  	}
docs: Remove session cause it's closed by the endpoint
  
  @param session