Municipal elections shall be nonpartisan and all candidates shall file as independent candidates unless, prior to the date for notifying the county election board of the call for the election, the municipality has in effect an ordinance providing for a partisan primary election consistent with Section 16-101 et seq. of Title 11 of the Oklahoma Statutes. No primary elections shall be held in a nonpartisan election. Any election proclamation or notice of election providing for a primary election shall be deemed to be amended by operation of this act¹ to delete the call for a primary election unless a copy of the ordinance authorizing the primary election is attached to the election resolution filed with the county election board. If such a copy is not attached, each candidate shall appear on the ballot as an independent candidate without party or other designation. Provided, any municipality which is governed by a charter may provide otherwise by charter or ordinance.