git-svn.perl: close the edit for propedits even with no mods

It's legitimate to update the mergeinfo property without
actually changing any files.  This can happen when changes are
backported to a branch, and then that branch is merged back
into mainline.  We still want to record the updated mergeinfo
for book-keeping.

Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Acked-by: Eric Wong <normalperson@yhbt.net>

git-svn.perl

@@ -5389,7 +5389,7 @@ sub apply_diff {
 			               $self->{mergeinfo});
 	}
 	$self->rmdirs if $_rmdir;
-	if (@$mods == 0) {
+	if (@$mods == 0 && !defined($self->{mergeinfo})) {
 		$self->abort_edit;
 	} else {
 		$self->close_edit;