100.5. The court of arbitration must give the interested certified association, the employer and employee an opportunity to be heard.
If an interested party hereinabove duly notified by a written notice of at least five clear days of the date, time and place at which it or he can be heard does not appear or refuses to be heard, the court of arbitration may proceed with the hearing of the matter and no judicial recourse shall be based on the fact that it has so proceeded in the absence of such party.