In the event that there is any land in the Village of Fox Point which, as shown by the Official Zoning Map or amendments thereto, is not included in a zoning district, or if the provisions of the ordinance placing any land in a zoning district are held invalid by a court of competent jurisdiction, either in its entirety or as to a specific lot, piece or parcel of land, then each such lot, piece or parcel of land shall be considered as in a C Residence District.