If a marriage is supposed to be void, or voidable, or any doubt exists as to its validity, for any of the causes set forth in section 3-103, or for any other cause recognized in law, either party may, except as provided in section 3-105, institute an action for annulling or affirming the marriage. Upon hearing the proofs and allegations of the parties, the court shall enter a judgment order annulling or affirming the marriage. In every case where the validity of a marriage is called into question, it is presumed that the marriage is valid, unless the contrary is clearly proved. If the court orders that the marriage is valid, the finding of the court is conclusive upon all persons concerned.