git-commit --amend: allow empty commit.
git-commit --amend: allow empty commit.

When amending a commit only to update the commit log message, git-status
would rightly say "Nothing to commit."  Do not let this prevent commit to
be made.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git