git-rebase skips automatically no more needed commits

Hello,

When rebasing my current branch onto the last master one, there're
sometimes some commits which doesn't add anything anymore.

Currently git-rebase produces the following message:

    nothing added to commit but untracked files present (use "git add" to track)

Would it be possible to add a new option to this command so it simply
skip the unneeded commit ?

Thanks
-- 
Francis