Provided, however, that the governing authorities of any county or municipality as the case may be are authorized herein to waive the entire provisions of Sections 75-65-1 through 75-65-17 in the case of any person upon a showing of facts to the satisfaction of said governing authorities that said person is for any cause actually and legitimately going out of business or conducting a sale of goods, wares or merchandise damaged by fire, smoke or otherwise. The governing authorities may likewise rescind any such waiver granted when in its opinion the applicant is no longer entitled to the privileges of the waiver previously granted.