Should any challenge be made to the procedural validity of the process used by the Township to enact the Official Zoning Map which is incorporated into this chapter, and should such procedure be determined to be invalid by a court of competent jurisdiction, such invalidity, illegality or unconstitutionality shall not affect or impair the remaining provisions, sections, sentences, clauses or parts of the text of this chapter, it being the intention of the Board of Supervisors that the remainder of the text of this chapter shall be and shall remain in full force and effect. The foregoing severability provision is intended to be applied to its fullest extent in order that the remainder of this chapter shall not be affected by any procedural defects relating to the Official Zoning Map, including but not limited to posting of properties to be rezoned. In addition, should the procedure used to enact the Official Zoning Map as a part of this Zoning Chapter be determined to be invalid by the Zoning Hearing Board or by a court of competent jurisdiction, then the Official Zoning Map enacted by the Board of Supervisors by Ordinance No. 80, enacted July 22, 1991, shall be considered to be the Official Zoning Map under this Zoning Chapter. If, as a result of such challenge, the Zoning Map adopted by Ordinance No. 80 shall be considered the Official Zoning Map under this chapter, all lands shall be classified as set forth in the Official Zoning Map adopted by Ordinance No. 80.