Fix new merge request branch validation check
What does this MR do and why?
Before this change the branch validation would check commits which allowed merge requests to be created from commits. However the UI would not correctly show the diff for the commit.
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
| Before | After |
|---|---|
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.