Do not check the status of a job execution if Oozie id is None

New job executions may not have an Oozie id assigned right away.
Skip the periodic status update for such jobs until the Oozie id
is no longer None.

Closes-Bug: #1263785
Change-Id: I26da336ff52962c1644ceba641428d2311950377
Merge "Do not check the status of a job execution if Oozie id is None"