MAGETWO-81994: Products added to cart with REST API give total prices equal to zero #11458

 - Merge Pull Request #11458 from peterjaap/magento2:fix-for-issue-2991
 - Merged commits:
   1. 80ed833
   2. 24d6a57
   3. a19eeb2
   4. 846f117

Author: Oleksii Korshenko

app/code/Magento/Quote/Model/QuoteManagement.php

@@ -232,6 +232,8 @@ public function createEmptyCart()
         $quote->setShippingAddress($this->quoteAddressFactory->create());
 
         try {
+            $quote->getShippingAddress()->setCollectShippingRates(true);
+
             $this->quoteRepository->save($quote);
         } catch (\Exception $e) {
             throw new CouldNotSaveException(__('Cannot create quote'));