If by the certificate of the county elections official the petition is shown to be sufficient, the county elections official of the principal county shall present the petition to the board of supervisors of the principal county without delay. When the petition is presented by the county elections official, the board of supervisors shall give notice of an election to be held in the district for the purpose of determining whether or not the petition shall be disincorporated and dissolved; provided, however, that in the event the district shall have issued bonds, the board of supervisors shall not consider the petition or take any action hereunder until evidence shall be furnished showing the bonds to have been fully satisfied.