From 9ebe7306896e3ff5d25ce2cd216f6209cccaee78 Mon Sep 17 00:00:00 2001
From: Barry Oosthuizen <barry.oosthuizen@nottingham.ac.uk>
Date: Wed, 23 Sep 2015 09:52:13 +0100
Subject: [PATCH] Fix issue #159 - Delete no selected sessions

---
 sessions.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sessions.php b/sessions.php
index 2b93633..f65aedd 100644
--- a/sessions.php
+++ b/sessions.php
@@ -126,8 +126,10 @@ switch ($att->pageparams->action) {
             }
             redirect($att->url_manage(), get_string('sessiondeleted', 'attendance'));
         }
-        $sessid = required_param_array('sessid', PARAM_SEQUENCE);
-
+        $sessid = optional_param_array('sessid', '', PARAM_SEQUENCE);
+        if (empty($sessid)) {
+            print_error('nosessionsselected', 'attendance', $att->url_manage());
+        }
         $sessionsinfo = $att->get_sessions_info($sessid);
 
         $message = get_string('deletecheckfull', '', get_string('session', 'attendance'));