Fix JobInjector error when stage does not exist for some jobs

Martin Cavojrequested to merge
mc/fix-job-injector-stage-variable into master

What does this MR do and why?

Fix JobInjector error when stage does not exist for some jobs.

Logs with the issue: https://log.gprd.gitlab.net/app/r/s/6pyZK

Related to #482860 (closed).

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Edited by Martin Cavoj

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