MAGETWO-83428: Fix 'Undefined variable: responseAjax' notice when trying to save a shipment package #12091

 - Merge Pull Request #12091 from lazyguru/magento2:fix-undefined-variable-responseAjax
 - Merged commits:
   1. 48a0415

Author: Oleksii Korshenko

app/code/Magento/Shipping/Controller/Adminhtml/Order/Shipment/Save.php

@@ -109,6 +109,8 @@ public function execute()
 
         $isNeedCreateLabel = isset($data['create_shipping_label']) && $data['create_shipping_label'];
 
+        $responseAjax = new \Magento\Framework\DataObject();
+
         try {
             $this->shipmentLoader->setOrderId($this->getRequest()->getParam('order_id'));
             $this->shipmentLoader->setShipmentId($this->getRequest()->getParam('shipment_id'));
@@ -143,7 +145,6 @@ public function execute()
             $shipment->register();
 
             $shipment->getOrder()->setCustomerNoteNotify(!empty($data['send_email']));
-            $responseAjax = new \Magento\Framework\DataObject();
 
             if ($isNeedCreateLabel) {
                 $this->labelGenerator->create($shipment, $this->_request);