Allow to create empty merge request from the new merge request page

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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).