Collective agreements in absence of employees
43An agreement in writing between an employer or employers’ organization, on the one hand, and a trade union that has been certified as bargaining agent for a unit of employees of the employer, or a trade union or a council of trade unions that is entitled to require the employer or the employers’ organization to bargain with it for the renewal or revision of the agreement then in operation or for the making of a new agreement, on the other hand, shall be deemed to be a collective agreement notwithstanding that there were no employees in the bargaining unit or units affected at the time the agreement was entered into.