Also make git-rebase-script stricter about dirty working tree.
Also make git-rebase-script stricter about dirty working tree.

Otherwise the first commit rebase makes could include whatever
dirty state the original working tree had.

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