[Bug] [MasterServer] cmdParam NPE when constructProcessInstance on SCHEDULER mode

[caishunfeng]

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• I had searched in the issues and found no similar issues.

What happened

[ERROR] 2021-10-11 23:38:00.433 org.apache.dolphinscheduler.server.master.runner.MasterSchedulerService:[211] - scan command error 
java.lang.NullPointerException: null
        at org.apache.dolphinscheduler.service.process.ProcessService.constructProcessInstance(ProcessService.java:804)
        at org.apache.dolphinscheduler.service.process.ProcessService.handleCommand(ProcessService.java:216)
        at org.apache.dolphinscheduler.service.process.ProcessService$$FastClassBySpringCGLIB$$ed138739.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:687)
        at org.apache.dolphinscheduler.service.process.ProcessService$$EnhancerBySpringCGLIB$$c9f32f1c.handleCommand(<generated>)
        at org.apache.dolphinscheduler.server.master.runner.MasterSchedulerService.scheduleProcess(MasterSchedulerService.java:189)
        at org.apache.dolphinscheduler.server.master.runner.MasterSchedulerService.run(MasterSchedulerService.java:169)

What you expected to happen

not NPE when run

How to reproduce

run some task

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

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