Appeal, insofar as taken from that part of the Appellate Division order that affirmed that portion of Supreme Court’s order denying appellants’ motion to amend the complaint, dismissed, without costs, by the Court of Appeals, sua sponte, upon the ground that such portion of the order appealed from does not finally determine the action within the meaning of the Consti *883 tution; appeal otherwise dismissed, without costs, by the Court of Appeals, sua sponte, upon the ground that no substantial constitutional question is directly involved.