Add some extra empty checks and add helper for checking vars

This should help to address issues with group wikis being unable to commit resources.

requested review from @cguindon, @droy, and @fgurr

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• 30318fb3 - Add fix to check GL envvars more closely

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• 52983fec - Add fix to check GL envvars more closely

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• 79fe9a64 - Add check to make sure GL_REPOSITORY starts with 'project-'

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• 88c61bd4 - Update envvar check to catch wiki commit earlier

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mentioned in merge request !74 (merged)

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