500 when changing project name and path at the same time.

While renaming a project I've try to change the project name and path at the same time. You can see below the steps and results.

Steps to reproduce:

• Create a repository on gitlab.com.
• Push some commits.
• Go to settings.
• Change the project name and path (Rename repository in Dangerous settings).
• Click the Rename button.
• Get 500 We're sorry, but something went wrong.
• Your repository is now at the new path with the old name and without commits/files (like at point one).

If you set the old path and save changes. Your are now like at point three.