Powers of board, etc., not affected by vacancy

Where any board, tribunal, commission, committee or similar body is established by or under any Act, the powers of such board, tribunal, commission, committee or similar body shall not be affected by (a) any vacancy in the membership thereof; (b) any defect in the appointment or qualification of a person purporting to be a member thereof; or (c) any minor irregularity in the convening of any meeting thereof.