fix the validation of the form in demo/tab.html

demo/tab.html

@@ -146,9 +146,10 @@ $(document).ready(function() {
         })
         .on('status.field.bv', function(e, data) {
             var $form     = $(e.target),
-                validator = $form.data('bootstrapValidator'),
+                validator = data.bv,
                 $tabPane  = data.element.parents('.tab-pane'),
                 tabId     = $tabPane.attr('id');
+            
             if (tabId) {
                 var $icon = $('a[href="#' + tabId + '"][data-toggle="tab"]').parent().find('i');