(1) A casual vacancy in the membership of the council is to be filled—
(a) if the statutes make provision for the filling of the casual vacancy—as provided by the statutes; or
(b) in any other case—as provided in section 11 (1) for the appointment or election of a person to the vacant office.
(2) A person appointed or elected to fill a casual vacancy holds office for the remainder of the term of office of the person's predecessor.
(3) In this section:
"casual vacancy", in the membership of the council, includes an office of a member mentioned in section 11 (1) (e), (f), (g) or (h) that is vacant and cannot be filled by an election because no nomination has been received for the office.