From cf9f20741dced688b3bca906116f630e401a20ba Mon Sep 17 00:00:00 2001
From: Dan Marsden <dan@danmarsden.com>
Date: Fri, 9 May 2014 13:29:41 +1200
Subject: [PATCH] CONTRIB-4864 prevent PHP warning when checking var

---
 locallib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/locallib.php b/locallib.php
index 912703d..53988ef 100644
--- a/locallib.php
+++ b/locallib.php
@@ -1091,7 +1091,7 @@ class attendance {
 
     public function get_user_taken_sessions_count($userid) {
         if (!array_key_exists($userid, $this->usertakensesscount)) {
-            if ($this->pageparams->startdate && $this->pageparams->enddate) {
+            if (!empty($this->pageparams->startdate) && !empty($this->pageparams->enddate)) {
                 $this->usertakensesscount[$userid] = att_get_user_taken_sessions_count($this->id, $this->course->startdate, $userid, $this->cm, $this->pageparams->startdate, $this->pageparams->enddate);
             } else {
                 $this->usertakensesscount[$userid] = att_get_user_taken_sessions_count($this->id, $this->course->startdate, $userid, $this->cm);