(a) Whenever any ordinance or part of an ordinance shall be repealed or modified by a subsequent ordinance, the ordinance or part of an ordinance thus repealed or modified shall continue in force until the due publication of the ordinance repealing or modifying it when publication is required to give effect thereto, unless otherwise expressly provided.
(b) When any ordinance repealing a former ordinance, clause or provision shall be itself repealed, the repeal shall not be construed to revive the former ordinance, clause or provision, unless it is expressly provided.