From 6b36cd591edd0ad81f6aea9fb02efe767e76be7b Mon Sep 17 00:00:00 2001
From: David Balch <david.balch@conted.ox.ac.uk>
Date: Mon, 8 Feb 2016 11:42:28 +0000
Subject: [PATCH] MDL-53027 calendar: Fix false empty result from
 calendar_get_events().

---
 calendar/lib.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/calendar/lib.php b/calendar/lib.php
index 5a40c690e1f..67da3e49e9a 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -693,8 +693,8 @@ function calendar_get_events($tstart, $tend, $users, $groups, $courses, $withdur
 
     $whereclause = '';
     $params = array();
-    // Quick test
-    if(is_bool($users) && is_bool($groups) && is_bool($courses)) {
+    // Quick test.
+    if (empty($users) && empty($groups) && empty($courses)) {
         return array();
     }