If any provision of this chapter relating either to the apportionment or allocation of the revenue derived from the excise tax thereby imposed, or to any appropriation made by this chapter, be adjudged unconstitutional, such adjudication shall not be held to render unconstitutional or ineffectual the remaining portions of said chapter or any part thereof: PROVIDED, HOWEVER, That except as otherwise hereinabove provided by this section, if any section or part of a section of this chapter be adjudged unconstitutional, this entire chapter shall thereupon be and become inoperative and of no force or effect whatsoever.