77. (1) No act done or proceedings taken under this Ordinance shall be questioned on the ground merely of-

(a) the existence of any vacancy in, or any defect in the constitution of, the Board; or

(b) any person having ceased to be a Director has continued to act as such; or

(c) the failure to serve a notice on any person, where no substantial injustice has resulted from such failure; or

(d) any omission, defect or irregularity not affecting the merits of the case.

(2) Every meeting of the Board, the minutes of the proceedings of which have been duly signed as prescribed in clause (5) of section 10 shall be taken to have been duly convened and to be free from all defects and irregularities.