18295585d9
`MergeRequest#source_sha` is expected to return the sha of the source branch last commit. But when a open Merge Request has no diff (e.g. all commits have already been merged to the target branch), `merge_request.source_sha` incorrectly returns `nil`. This was un-noticed before – but now that !2217 has been merged, it makes `Gitlab::Git::Commit.between` raise an "Unexpected nil argument" exception. This fixes the crash, by making sure that `source_sha` returns a correct result even when there is no diff available. |
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