MAGETWO-90729: Imported products are incorrectly in stock if 'allow_backorders' enabled

Author: DianaRusin

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -865,11 +865,8 @@ public function __construct(
             $string,
             $errorAggregator
         );
-        $this->_optionEntity = isset(
-            $data['option_entity']
-        ) ? $data['option_entity'] : $optionFactory->create(
-            ['data' => ['product_entity' => $this]]
-        );
+        $this->_optionEntity = $data['option_entity'] ??
+            $optionFactory->create(['data' => ['product_entity' => $this]]);
         $this->_initAttributeSets()
             ->_initTypeModels()
             ->_initSkus()