From c327cc5c77d9e5d96046eab4a6d0903e3918e5d5 Mon Sep 17 00:00:00 2001
From: Rushikesh <rushikeshnalla9@gmail.com>
Date: Thu, 21 Jan 2016 22:20:17 +0530
Subject: [PATCH] MDL-29817 Form : advcheckbox allows attributes even without
 group key

---
 lib/form/advcheckbox.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/form/advcheckbox.php b/lib/form/advcheckbox.php
index 79cd5a47123..f023a2c01bb 100644
--- a/lib/form/advcheckbox.php
+++ b/lib/form/advcheckbox.php
@@ -61,7 +61,7 @@ class MoodleQuickForm_advcheckbox extends HTML_QuickForm_advcheckbox{
             $values = array(0, 1);
         }
 
-        if (!is_null($attributes['group'])) {
+        if (!empty($attributes['group'])) {
 
             $this->_group = 'checkboxgroup' . $attributes['group'];
             unset($attributes['group']);