移除系统会话相关的消息统计和不在权限内的消息统计

src/server/models/sessions/sessions.js

@@ -597,6 +597,7 @@ class Sessions extends RedisModel {
                            return;
                        }
                        if(endMsgScore>startMsgScore){
                            console.error("endMsgScore>startMsgScore");
                            redis.zrangebyscoreAsync(messagesTimestampKey, startMsgScore, endMsgScore, "limit", offset, count)
                                .then(function (res) {
                                    if (res.length == 0) {
@@ -616,6 +617,7 @@ class Sessions extends RedisModel {
                                    handler(err, false);
                                })
                        }else{
                            console.error(3);
                            // 从消息时间表中过滤出要获取的消息ID列表，倒序取出消息
                            redis.zrevrangebyscoreAsync(messagesTimestampKey, startMsgScore, endMsgScore, "limit", offset, count)
                                .then(function (res) {