The proceedings of a local government or any of its committees, or the actions of a person acting as a councillor or member of a committee, are not invalid merely because of—
(a) vacancies in the membership of the local government or committee; or
(b) a defect or irregularity in the election or appointment of any councillor or committee member; or
(c) the disqualification of a councillor or committee member from acting as a councillor or committee member.