Section 14. vacancy in the office of 1Mayor or 10 * * *

14. If a casual vacancy occurs in the office of 1[Mayor] or 1[ * * *] owing to death or resignation or any other cause a 1[Mayor] or 1[ * * *] , as the case may be, shall be elected as soon as may be thereafter in the manner provided under 2[in section 11-A or section 12, as the case may be] : Provided that where the remainder of the term is two months or less the vacancy shall remain unfilled unless the 1[Corporation] resolves otherwise.