Defect or Vacancy not to invalidate acts

No Act or proceeding of the Board or any person acting as the President , Vice-President or a member of the Board shall be deemed to be invalid by reason only of the existence of a vacancy among its members or a defect in the constitution thereof or on the ground that the President, Vice-President or any member of the Board was not entitled to hold or to continue in office by reason of any disqualification or by reason of any irregularity or illegality in his appointment.