1Where one of the parties has not performed one of his obligations, he shall not be liable for such non-performance if he can prove that it was due to circumstances which, according to the intention of the parties at the time of the conclusion of the contract, he was not bound to take into account or to avoid or to overcome ; in the absence of any expression of the intention of the parties, regard shall be had to what reasonable persons in the same situation would have intended.
2Where the circumstances which gave rise to the non-performance of the obligation constituted only a temporary impediment to performance, the party in default shall nevertheless be permanently relieved of his obligation if, by reason of the delay, performance would be so radically changed as to amount to the performance of an obligation quite different from that contemplated by the contract.
3The relief provided by this Article for one of the parties shall not include the avoidance of the contract under some other provision of the present Law or deprive the other party of any right which he has under the present Law to reduce the price, unless the circumstances which entitled the first party to relief were caused by the act of the other party or of some person for whose conduct he was responsible.