Ticket #29572: 29572.4.diff

src/wp-admin/js/customize-controls.js

@@ -161 +161 @@
                  */
                 renderContent: function( callback ) {
                         var template,
-                            selector = 'customize-control-' + this.params.type + '-content',
-                            callback = callback || function(){};
+                                selector = 'customize-control-' + this.params.type + '-content';
+
+                        callback = callback || function(){};
                         if ( 0 !== $( '#tmpl-' + selector ).length ) {
                                 template = wp.template( selector );
                                 if ( template && this.container ) {