No cause of action determined by the court to be, upon proper motion of any party to the controversy, frivolous, insubstantial or without actionable cause shall be submitted to arbitration.
The provisions of this section shall not apply to any controversy on which an arbitration decision was rendered prior to the filing of the action.
The provisions of this section shall apply to any cause of action, subject to this section, filed prior to the operative date of this act, if a pretrial conference has not been concluded thereon.
N.J.S. § 39:6A-25