Fix bug in form error display logic, which throws exception and preve…

…nts event for after phase to be triggered.

src/w2form.js

@@ -353,7 +353,7 @@
             var eventData = this.trigger({ phase: 'before', target: this.name, type: 'validate', errors: errors });
             if (eventData.isCancelled === true) return;
             // show error
-            if (showErrors) for (var e in eventData.errors) {
+            if (showErrors) for (var e = 0; e < eventData.errors.length; e++) {
                 var err = eventData.errors[e];
                 if (err.field.type == 'radio') { // for radio and checkboxes
                     $($(err.field.el).parents('div')[0]).w2tag(err.error, { "class": 'w2ui-error' });