Merge branch 'bugfix/13-undefined-if-no-user' into 'master'

bugfix: returns nothing if no user logged in #13

Closes #13

See merge request !7

sib-notifications.js

@@ -145,6 +145,7 @@ class SIBNotifications extends SIBTemplateElement {
       </div>
       `;
     }
+    return '';
   }
 }