MAGETWO-70817: remove redundant else and use strict check #10271

 - Fixed coding style

Author: ishakhsuvarov

app/code/Magento/Catalog/Model/Product/Attribute/Backend/Media/ImageEntryConverter.php

@@ -102,7 +102,8 @@ protected function convertFromMediaGalleryEntryContentInterface(
     ) {
         if ($content === null) {
             return null;
-        } 
+        }
+
         return [
             'data' => [
                 ImageContentInterface::BASE64_ENCODED_DATA => $content->getBase64EncodedData(),