Fix issue #62787070: restart due to NPE in JobServiceContext...

...handleOpTimeoutLocked

Don't try to print the running job if it is null.

Also, the timeout message should be scheduled with the actually
running job it is for, so we can ignore it if we happen to
dispatch one after the job is over.

Test: bit CtsJobSchedulerTestCases:*

Change-Id: I7bc55f55da645a9e116d3f0ee02f2ee115383ea9