append label only when formatted is not undefined

select2.js

@@ -883,9 +883,9 @@ the specific language governing permissions and limitations under the Apache Lic
                             formatted=opts.formatResult(result, label, query, self.opts.escapeMarkup);
                             if (formatted!==undefined) {
                                 label.html(formatted);
+                                node.append(label);
                             }
 
-                            node.append(label);
 
                             if (compound) {