WebIDE doesn't work on empty repositories again

Summary

The work on gitlab-foss#45687 (closed) allowed users to open empty repositories in the Web IDE. This isn't working anymore now though.

Steps to reproduce

  1. Create a new empty project. Do not create the project with a README
  2. Open the project via direct url: https://gitlab.com/-/ide/project/<group>/<project>/edit/master/-/

What is the current bug behavior?

empty

/cc @mishunov

Edited by Marcel van Remmerden