4. For the application of section 3:(1) in the case of a municipality whose territory is divided into districts or wards, except where the office of mayor or all the offices of councillor are open for nominations, the list of electors of the municipality is deemed to be that of the district or ward in which an office of councillor is open for nominations or, as the case may be, all of those districts of wards;
(2) the list of electors of a municipality referred to in paragraph 1 is deemed prepared or revised for the election where the lists of one-half or more of the districts or wards, or one-half or more of those referred to in that paragraph where it does not involve an election for the office of mayor or for all the offices of councillor, are prepared or revised;
(3) a list is not deemed revised where its revision has been interrupted.