This Article 17 is promulgated pursuant to the authority of MGL c. 40R and MGL c. 40A, as applicable. If any provision of this Article 17 is found to be invalid by a court of competent jurisdiction, the remainder of Article 17 shall not be affected but shall remain in full force and effect. The invalidity of any provisions of this Article 17 shall not affect the validity of the remainder of this article.