当某个job的glue_updatetime为NULL时，执行会失败

[MakiseSuki]

Please answer some questions before submitting your issue. Thanks!

Which version of XXL-JOB do you using?

2.4.1

Expected behavior

任务执行成功

Actual behavior

页面提示执行成功，但查看调度日志，调度结果以及执行时间为空，调度备注显示“无”
查看日志提示空指针

17:10:00.041 logback [xxl-job, admin JobTriggerPoolHelper-fastTriggerPool-2092863364] ERROR c.x.j.a.c.t.JobTriggerPoolHelper - null
java.lang.NullPointerException: null
        at com.xxl.job.admin.core.trigger.XxlJobTrigger.processTrigger(XxlJobTrigger.java:137)
        at com.xxl.job.admin.core.trigger.XxlJobTrigger.trigger(XxlJobTrigger.java:83)
        at com.xxl.job.admin.core.thread.JobTriggerPoolHelper$3.run(JobTriggerPoolHelper.java:95)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)

Steps to reproduce the behavior

通过SQL插入xxl_job_info，但不指定glue_updatetime的值

INSERT INTO `xxl_job_info` (`id`, `job_group`, `job_desc`, `author`, `schedule_type`, `schedule_conf`, `misfire_strategy`, `executor_route_strategy`, `executor_handler`, `executor_param`, `executor_block_strategy`, `glue_type`, `trigger_status`)
VALUES
(21, 8, '更新数据', 'makise', 'CRON', '0 0/10 * * * ?', 'DO_NOTHING', 'FIRST', 'updateData', NULL, 'DISCARD_LATER', 'BEAN', 1);

无论通过接口调用或者页面上手动执行，都会有问题
去查看这个任务的信息也看不出问题，当点击保存之后，glue_updatetime有了值，就正常了

[MakiseSuki]

初始化SQL中，这个字段default NULL，是否可以调整