Whenever an elective office is created in a city, village or town pursuant to law or ordinance, the office shall not be deemed vacant until it has first been filled by the electorate, except that if a city, village or town enacts an ordinance or bylaw creating a municipal court under s. 755.01 before the December 1 preceding the spring election the office of municipal judge for that court shall be considered vacant and a temporary appointment may be made by the city, village or town governing body pending the election of the initial elected occupant of the office.