MC-30944: Incorrect flow of saving Newsletter templates

Author: dvoskoboinikov

app/code/Magento/Newsletter/Controller/Adminhtml/Template/Save.php

@@ -32,9 +32,7 @@ public function execute()
         }
 
         try {
-            $template->addData(
-                $request->getParams()
-            )->setTemplateSubject(
+            $template->setTemplateSubject(
                 $request->getParam('subject')
             )->setTemplateCode(
                 $request->getParam('code')