From c45ef8bc2fdf615eafa49739ec90a38967a83147 Mon Sep 17 00:00:00 2001
From: Rushikesh <rushikeshnalla9@gmail.com>
Date: Thu, 21 Jan 2016 22:13:27 +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 26ae788005f..e3455810121 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']);