git diff only diffs unstaged commits
git add . does not stage empty directories
if you add a new file to the empty directory it does not get tracked
a quote i like
I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain. ― Frank Herbert, Dune