Should any provision or section, or portion thereof of this charter be held by a court of competent jurisdiction to be invalid, illegal or unconstitutional, such holding shall not be construed as affecting the validity of this charter as a whole or of any remaining portion of such provision or section, it being hereby declared to be the intent of the charter commission and of the electors who voted thereon that such unconstitutionality or illegality shall not affect the validity of any other part of this charter except that specifically affected by such holding.