Section 45A does not affect the operation of any law (a) prescribing circumstances in which the offices of members of a municipal council shall become and remain vacant;(b) providing for the administration of any area of the State (i) to which the system referred to in that section does not for the time being extend; or(ii) when the offices of all the members of the municipal council for that area are vacant; or(c) conferring any power relating to local government on a person other than a municipal council.