Upon the hearing of said rule, if it shall be made to appear to the satisfaction of said court that the said officer is in default for the non-payment of money due the Commonwealth, the said court shall forthwith make a decree dismissing him from the said office; and upon receiving a certified copy of said decree, the commissioners of the proper county shall immediately fill the vacancy thereby created, until the next general election, by the appointment of a suitable person, who shall give bond in such amount and with such sureties as shall be ordered and approved by the court of quarter sessions of the proper county: Provided, That if the sum so found due be paid at any time before such decree is made, it shall discharge the proceedings.