[fix] Access to an undefined property Magento\Webapi\Controller\Soap::$_appState

Author: Marcel Hauri

app/code/Magento/Webapi/Controller/Soap.php

@@ -51,6 +51,11 @@ class Soap implements \Magento\Framework\App\FrontControllerInterface
      */
     protected $_errorProcessor;
 
+    /**
+     * @var \Magento\Framework\App\State
+     */
+    protected $_appState;
+
     /**
      * @var \Magento\Framework\Locale\ResolverInterface
      */