The price

   (1)  Where there is an agreement to sell goods on the terms that the price is to be fixed by the valuation of a third party and such third party cannot or does not make such valuation, the agreement is thereby avoided:

   Provided that, if the goods or any part thereof have been delivered to, and appropriated by, the buyer, he shall pay a reasonable price therefor.

   (2)  Where such third party is prevented from making the valuation by the fault of the seller or buyer, the party not in fault may maintain a suit for damages against the party in fault