The pre-commit hook was failing when there were staged deleted files
because:
- It was using 'ls' to filter files, which fails when they don't exist
in the filesystem
- Deleted files are still in Git's staging area but not in the
filesystem
Changes made:
1. Added a check to filter files with 'test -f' before passing to
Rubocop
2. Added the same check for staging Rubocop's changes
3. Added '|| true' to prevent errors when no files match the filters
This ensures the pre-commit hook completes successfully even when files
are staged for deletion.
8d92862ba9