The Commissioner may petition for an order dissolving the corporate existence of a domestic insurer or the United States branch of an alien insurer domiciled in this state at the time he applies for a liquidation order. The court shall order dissolution of the corporation upon petition by the Commissioner upon or after the granting of a liquidation order. If the dissolution has not previously been ordered, it shall be effected by operation of law upon the discharge of the liquidator if the insurer is insolvent but may be ordered by the court upon the discharge of the liquidator if the insurer is under a liquidation order for some other reason.