Sec. 5.2  Vacancies in office.
   Any city office shall be declared vacant by the council upon the occurrence of any of the following events before the expiration of the term of such office:
   (a)   For any reason specified by law as creating a vacancy in office;
   (b)   If the officer ceases to be a registered elector of the city;
   (c)   If no person is elected to, or qualifies for, the office at the election at which such office is to be filled;
   (d)   If the officer shall be found guilty by a court of competent jurisdiction of any act constituting a violation of the provisions of this charter;
   (e)   If the officer shall absent himself continuously from the city for more than 60 consecutive days in any one calendar year without the permission of the council;
   (f)   If the officer is removed from office by the council in accordance with the provisions of Section 5.3.