[5.8] Fix worker timeout handler when there is no job processing #29366
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Fixes the issue mentioned in #29024 (comment)
The queue worker timeout handler may be called with a null
$job
if the timeout is reached when there is no job processing (perhaps it took too long to fetch the next job in the worker loop). This fix checks to make sure there is a job before attempting to mark the as failed if it will exceed the maximum number of attempts.