[v0.9.8.3.1][Amazon] onIabPurchaseFinished is not invoked when canceling purchase

[MikhailAOstapenko]

Hi guys,

Reproducing steps:

1. Launch purchase flow
2. In Amazon billing window press 'Cancel' button
3. Nothing happens

Same code works fine with GooglePlay and SamsungApps stores. It's looks like some unhandled exception occurred inside AmazonAppstoreBillingService.onPurchaseResponse function.

Here is my log:
01-22 15:28:41.291: D/c(3119): In App Purchasing SDK - Sandbox Mode: handleResponse
01-22 15:28:41.291: D/OpenIAB(3119): onPurchaseResponse() PurchaseRequestStatus:FAILED, reqId: 9e111a5e-0694-4ef9-8396-1804ec7267b3
01-22 15:28:41.291: E/c(3119): In App Purchasing SDK - Sandbox Mode: Error in sendResponse: java.lang.NullPointerException