The expenses of the charter commission, and the cost of publishing, distributing and advertising the proposal or proposals of the commission or of the city council of the city or of electors and the proclamations as required by section 15 of this act, and all other expenses of the commission and of the city council incurred in connection with any proceedings hereinbefore provided for, when not otherwise provided for by law, may be paid from the city treasury as the city council of the city may provide.
53 P.S. § 13216