If there is no valuation in the policy, the measure of indemnity in an insurance against fire is the full amount stated in the policy. If there is a valuation in the policy, the valuation is conclusive between the parties in the adjustment either of a partial or a total loss if the insured has some interest at risk and there is no fraud on the insured’s part. In the event of a partial loss, the insurer is liable only for the proportion of the amount insured as the loss bears to the value of the whole interest of the insured in the property insured. A valuation fraudulent in fact, however, entitles the insurer to rescind the contract. The provisions of this section may not be construed as a revocation of any of the rights of insurers delineated in section 26.1-39-05.