Add method missing from EE
What does this MR do?
Are there points in the code the reviewer needs to double check?
No
Why was this MR needed?
ProjectWiki#repository_exists?
is present in EE but not on CE, and there's no particular reason why it shouldn't
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
-
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together