MQE-1427: Support _CREDS in <magentoCLI> action and in Data

- Correcting an issue around null values in the PersistedObjectHandler.

Author: ivy00johns

src/Magento/FunctionalTestingFramework/DataGenerator/Handlers/PersistedObjectHandler.php

@@ -84,6 +84,10 @@ public function createEntity(
         foreach ($dependentObjectKeys as $objectKey) {
             $retrievedDependentObjects[] = $this->retrieveEntity($objectKey, $scope);
         }
+
+        foreach ($overrideFields as $index => $field) {
+            $overrideFields[$index] = CredentialStore::getInstance()->decryptAllSecretsInString($field);
+        }
 
         $retrievedEntity = DataObjectHandler::getInstance()->getObject($entity);
         $persistedObject = new DataPersistenceHandler(

src/Magento/FunctionalTestingFramework/Util/TestGenerator.php

@@ -755,7 +755,7 @@ public function generateStepsPhp($actionObjects, $generationScope = TestGenerato
                     if (count($customEntityFields) > 1) {
                         $createEntityFunctionCall .= ",\n\t\t\t\${$stepKey}Fields";
                     } else {
-                        $createEntityFunctionCall .= ",\n\t\t\tnull";
+                        $createEntityFunctionCall .= ",\n\t\t\t[]";
                     }
                     if ($storeCode !== null) {
                         $createEntityFunctionCall .= ",\n\t\t\t\"{$storeCode}\"";