Allow to create empty merge request from the new merge request page
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=485854) </details> <!--IssueSummary end--> The 'New merge request' page (coming from the merge requests list) is rather confusing if you want to create the change without ever leaving GitLab app. The page expects you to already have the branch ready. The actual process to create a new MR looks like this: 1. Create the branch manually (you have to know where to find this button) 2. Click 'Compare' 3. Click 'Create merge request', save it 4. Click 'Open in WebIDE' to create changes It would be nice if this process was discoverable from the 'New merge request' page itself or was simplified to a single form (create a branch for me).
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