No judgment rendered more than ten (10) years prior hereto against unknown heirs, executors, administrators, devisees, trustees or assigns of any deceased person or, in the alternative, against a person or his unknown heirs, executors, administrators, devisees and assigns, shall ever be construed or held to be either void or voidable on the ground of the alleged insufficiency of said affidavit, provided the requirements of 12 O.S.1961, § 171, are met in such affidavit, either directly or by inference. All such judgments, if not otherwise defective, are hereby declared valid and legally effective and conclusive as of the date thereof. Provided, that nothing in this act shall be construed to affect any litigation now pending in any courts of the State of Oklahoma on the effective date of this act.¹