(a) In this section "warranty" means any provision of an insurance contract which has the effect of requiring, as a condition precedent of the taking effect of such contract or as a condition precedent of the insurer's liability thereunder, the existence of a fact which tends to diminish, or the non-existence of a fact which tends to increase, the risk of the occurrence of any loss, damage, or injury within the coverage of the contract. The term "occurrence of loss, damage, or injury" includes the