git status and empty directories

Today I've been working on some source with many empty directories. git-status shows all empty directories under "Untracked files: (use "git add" to add to commit)" but adding is impossible. And if it would be possible to add the directory, because a new file exists in the directory, it still shows up in the same place, indistinguishable from the empty directories.

Things I could think of to solve this:
- hide empty directories if the user does not ask explicitly for them
  with a command line option
- vice versa: add a command line option to hide empty directories
(I'd prefer the first one)

Another category in git-status for empty directories which cannot be added could be interesting too because the comment 'use "git add" to add to commit' is quite misleading.

Perhaps there should also be another option to show files in untracked directories.

Any comments? If a patch would be accepted I'll take a look at writing one. Adding the correct options to git-ls-files seems quite trivial.