Deleting the .git folder while lazygit is open causes it to crash

**Describe the bug**
When lazygit is open and the `.git` folder is deleted lazygit crashes.

**To Reproduce**

1. Run `git init`
2. Run `lazygit
3. Delete the `.git` folder while lazygit is running

**Expected behavior**
That lazygit exists cleanly with an error message, For example: ".git folder was deleted, exiting..."

**Screenshots**

**Version info:**
commit=, build date=, build source=nix, version=0.40.2, os=darwin, arch=arm64, git version=2.43.0
git version 2.43.0