Handle missing .gitmodules when getting submodule urls
What does this MR do?
Adds a test for a submodule parsing edge case and fixes a related bug.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
This would throw an exception if there was no .gitmodules.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together