cherry-pick: picking a tag that resolves to a commit is OK

Earlier, 21246db (cherry-pick: make sure all input objects are
commits, 2013-04-11) tried to catch an unlikely "git cherry-pick $blob"
as an error, but broke a more important use case to cherry-pick a
tag that points at a commit.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

sequencer.c

@@ -1077,10 +1077,10 @@ int sequencer_pick_revisions(struct replay_opts *opts)
 			continue;
 
 		if (!get_sha1(name, sha1)) {
-			enum object_type type = sha1_object_info(sha1, NULL);
-
-			if (type > 0 && type != OBJ_COMMIT)
+			if (!lookup_commit_reference_gently(sha1, 1)) {
+				enum object_type type = sha1_object_info(sha1, NULL);
 				die(_("%s: can't cherry-pick a %s"), name, typename(type));
+			}
 		} else
 			die(_("%s: bad revision"), name);
 	}