From 099d72186efc6568e90bed09936d66f825fecae7 Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <bruederli@kolabsys.com>
Date: Wed, 26 Mar 2014 08:53:01 +0100
Subject: [PATCH] Missing PARTSTAT attributes should be treated as NEEDS-ACTION
 (#2941)

---
 plugins/libcalendaring/lib/libcalendaring_itip.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/libcalendaring/lib/libcalendaring_itip.php b/plugins/libcalendaring/lib/libcalendaring_itip.php
index d285960b..a703160f 100644
--- a/plugins/libcalendaring/lib/libcalendaring_itip.php
+++ b/plugins/libcalendaring/lib/libcalendaring_itip.php
@@ -425,7 +425,7 @@ class libcalendaring_itip
                 if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
                     $metadata['attendee'] = $attendee['email'];
                     $metadata['rsvp'] = $attendee['rsvp'] || $attendee['role'] != 'NON-PARTICIPANT';
-                    $rsvp_status = strtoupper($attendee['status']);
+                    $rsvp_status = !empty($attendee['status']) ? strtoupper($attendee['status']) : 'NEEDS-ACTION';
                     break;
                 }
             }