为什么请求的会话列表总是多一行，且第一行是空的

  List<Pair<Long, EMConversation>> sortList = new ArrayList<Pair<Long, EMConversation>>();

        synchronized (conversations) {

            for (EMConversation conversation : conversations.values()) {

                if (conversation.getAllMessages().size() != 0) {

                    //if(conversation.getType() != EMConversationType.ChatRoom){

                        sortList.add(new Pair<Long, EMConversation>(conversation.getLastMessage().getMsgTime(), conversation));

                    //}

                }

            }

        }

对空会话 做了过滤的。