Allow empty merge requests
What does this MR do?
Allows empty merge requests for a workflow described in gitlab-org/gitlab-ce#14606
Are there points in the code the reviewer needs to double check?
I'm not sure if the representation of "There are not commits yet" is Ok from the UI perspective.
Why was this MR needed?
gitlab-org/gitlab-ce#14606
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
gitlab-org/gitlab-ce#14606