fixed warning in participants block

diff --git a/blocks/participants/block_participants.php b/blocks/participants/block_participants.php
index 39857e8a0ac33a7d7da707fd3fb3aa1338cf0185..06921eb075b4c1b39150a7ef90de98dff28fbdbc 100644 (file)
--- a/blocks/participants/block_participants.php
+++ b/blocks/participants/block_participants.php
@@ -11,7 +11,7 @@ class block_participants extends block_list {
         global $USER, $CFG;
        
                // the following 3 lines is need to pass _self_test();
-               if (!$this->instance->pageid) {
+               if (empty($this->instance->pageid)) {
                        return '';  
                }