MAGETWO-62044: Not possible to update or delete products in cart or checkout after deleting address

Author: magicbunneh

app/code/Magento/Quote/Api/Data/AddressInterface.php

@@ -370,7 +370,7 @@ public function getCustomerAddressId();
     /**
      * Set customer address id
      *
-     * @param int $customerAddressId
+     * @param int|null $customerAddressId
      * @return $this
      */
     public function setCustomerAddressId($customerAddressId);

app/code/Magento/Quote/Model/Quote/ShippingAssignment/ShippingAssignmentProcessor.php

@@ -99,7 +99,6 @@ public function save(CartInterface $quote, ShippingAssignmentInterface $shipping
             try {
                 $this->addressRepository->getById($shippingAddress->getCustomerAddressId());
             } catch (NoSuchEntityException $e) {
-                $shippingAddress->setCustomerAddressId(null);
                 $shippingAssignment->getShipping()->getAddress()->setCustomerAddressId(null);
             }
         }

app/code/Magento/Quote/Test/Unit/Model/Quote/ShippingAssignment/ShippingAssignmentProcessorTest.php

@@ -155,7 +155,7 @@ public function testSaveWithNotExistingCustomerAddress()
             ->method('getById')
             ->with($customerAddressId)
             ->willThrowException(new NoSuchEntityException());
-        $this->shippingAddressMock->expects(static::exactly(2))
+        $this->shippingAddressMock->expects(static::once())
             ->method('setCustomerAddressId')
             ->with(null)
             ->willReturn($this->shippingAddressMock);

dev/tests/integration/testsuite/Magento/Quote/Model/QuoteRepositoryTest.php

@@ -117,7 +117,6 @@ public function testSaveWithNotExistingCustomerAddress()
         $this->quoteRepository->save($quote);
 
         $this->assertNull($quote->getBillingAddress()->getCustomerAddressId());
-        $this->assertNull($quote->getShippingAddress()->getCustomerAddressId());
         $this->assertNull(
             $quote->getExtensionAttributes()
                 ->getShippingAssignments()[0]