bugfix：目录订阅收到更新事件时，sql字段update_time为空导致的报错

lishuyuan

2023-11-02 8bd2f47c9a92ffcf5ae43fae965eaefd4748e263

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package com.genersoft.iot.vmp.media.zlm.dto;
 
public class ServerKeepaliveData {
}