成员变化的时候时间更新为空问题处理

src/server/repository/mysql/topics.repo.js

@@ -206,7 +206,7 @@ class TopicRepo {
        let sql = "SELECT s.id session_id, s.name session_name, s.create_date session_create_time, s.last_message_time, " +
            "t.id topic_id, t.name topic_name, t.create_time topic_create_time, t.start_message_id " +
            "FROM sessions s, wlyy_consults t " +
            "WHERE c.con s.id = t.session_id  AND t.end_message_id IS NULL AND s.last_sender_id IN (SELECT id FROM doctors d where d.id<>t.patient) " +
            "WHERE s.id = t.session_id  AND t.end_message_id IS NULL AND s.last_sender_id IN (SELECT id FROM doctors d where d.id<>t.patient) " +
            "AND UNIX_TIMESTAMP(now()) - UNIX_TIMESTAMP(s.last_message_time) > ? " +
            "ORDER BY t.create_time";