fix logger message after attaching file

src/client/js/components/PageEditor.jsx

@@ -162,7 +162,7 @@ class PageEditor extends React.Component {
 
       // when if created newly
       if (res.pageCreated) {
-        logger.info('Page is created', res.pageCreated._id);
+        logger.info('Page is created', res.page._id);
         pageContainer.updateStateAfterSave(res.page);
       }
     }