(a) If part of the territory to be included in a district is located in a municipality, a separate voting district may not be established in the municipality for the purpose of determining whether the municipality as a separate area is to be included in the district.
(b) If for any other reason the territory in a municipality is established as a separate voting district, the failure by the voters in the municipal territory to confirm the creation of the district or the annexation of territory to a district does not prevent the territory in the municipality from being included in the district.