Notwithstanding the provisions of section twelve of this article, in the event that an employee of the Higher Education Policy Commission, Council for Community and Technical College Education or of any of the institutions which they govern elects to receive his or her salary over the complete twenty-six biweekly pay cycle, warrants may be drawn for the biweekly pay periods covering the months of July and August following the fiscal year during which such salary was earned: Provided, That such warrants have been encumbered by the commission, council or institution and the Budget Office prior to June 30 of said fiscal year.