MAGETWO-54262: Cannot remove product from shopping cart

 - This reverts commit b9e0026.

Author: ishakhsuvarov

app/code/Magento/CatalogInventory/Model/Quote/Item/QuantityValidator.php

@@ -183,6 +183,13 @@ public function validate(\Magento\Framework\Event\Observer $observer)
                     \Magento\CatalogInventory\Helper\Data::ERROR_QTY,
                     $result->getMessage()
                 );
+
+                $quoteItem->getQuote()->addErrorInfo(
+                    $result->getQuoteMessageIndex(),
+                    'cataloginventory',
+                    \Magento\CatalogInventory\Helper\Data::ERROR_QTY,
+                    $result->getQuoteMessage()
+                );
             } else {
                 // Delete error from item and its quote, if it was set due to qty lack
                 $this->_removeErrorsFromQuoteAndItem($quoteItem, \Magento\CatalogInventory\Helper\Data::ERROR_QTY);

app/code/Magento/Checkout/Block/Cart.php

@@ -108,20 +108,12 @@ public function prepareItemUrls()
     }
 
     /**
+     * @codeCoverageIgnore
      * @return bool
      */
     public function hasError()
     {
-        if ($this->getQuote()->getHasError()) {
-            return true;
-        }
-
-        foreach ($this->getQuote()->getItems() as $quoteItem) {
-            if (!empty($quoteItem->getErrorInfos())) {
-                return true;
-            }
-        }
-        return false;
+        return $this->getQuote()->getHasError();
     }
 
     /**