§ 1398. Separability. If any clause, sentence, paragraph, part or provision of this title shall for any reason be adjudged by a court of competent jurisdiction to be unconstitutional, ineffective or invalid, such judgment shall not affect, impair or invalidate the remainder of this title, but shall be confined in its operation to the clause, sentence, paragraph, part or provision thereof directly involved in the controversy in which such judgment shall have been rendered.