MCP-792: Wrong error message is sent in email if order is rejected because of disabled product

Author: aa-kashk

app/code/Magento/Checkout/Model/GuestPaymentInformationManagement.php

@@ -120,7 +120,7 @@ public function savePaymentInformationAndPlaceOrder(
             //Have to do this hack because of savePaymentInformation() plugins.
             $this->saveRateLimitDisabled = true;
             $this->savePaymentInformation($cartId, $email, $paymentMethod, $billingAddress);
-        } catch (\Magento\Framework\Exception\LocalizedException $e) {
+        } catch (\Magento\Framework\Exception\CouldNotSaveException $e) {
             $this->getLogger()->critical(
                 'Placing an order with quote_id ' . $cartId . ' is failed: ' . $e->getMessage()
             );
@@ -184,7 +184,7 @@ public function savePaymentInformation(
         }
         $this->limitShippingCarrier($quote);
 
-        if (!$quote->getItemsQty()) {
+        if (!(int)$quote->getItemsQty()) {
             throw new CouldNotSaveException(__('Some of the products are disabled.'));
         }