Cannot rename empty repository

Issue Summary

It's not currently possible to rename an empty repository.

Steps to Reproduce

1. Create a new repository
2. Make sure that no commit is created, not even README or .gitignore
3. Try to rename the repository under Repository Settings

Expected Results

Repository is renamed successfully.

Actual Results

The below exception error is shown:

Please fix errors belowMain branch needs your attention 

Workaround

Add at least one commit to the repository and try to rename again.