ENGCOM-4417: Cannot return null for non-nullable field SelectedShippingMethod.amount #417

 - Merge Pull Request magento/graphql-ce#417 from XxXgeoXxX/graphql-ce:2.3-devlop#402
 - Merged commits:
   1. 5bbb8bb

Author: magento-engcom-team

app/code/Magento/QuoteGraphQl/Model/Cart/ExtractDataFromAddress.php

@@ -55,6 +55,7 @@ public function execute(QuoteAddress $address): array
                 'code' => $address->getShippingMethod(),
                 'label' => $address->getShippingDescription(),
                 'free_shipping' => $address->getFreeShipping(),
+                'amount' => $address->getShippingAmount()
             ],
             'items_weight' => $address->getWeight(),
             'customer_notes' => $address->getCustomerNotes()