From 449d4ad81b6f65a60264f9b5749462ca1480928b Mon Sep 17 00:00:00 2001
From: Thomas Bruederli <bruederli@kolabsys.com>
Date: Thu, 9 Oct 2014 18:58:46 +0200
Subject: [PATCH] Filter empty recurrence attributes

---
 plugins/libcalendaring/libvcalendar.php | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/plugins/libcalendaring/libvcalendar.php b/plugins/libcalendaring/libvcalendar.php
index bdf8dea7..c80565dc 100644
--- a/plugins/libcalendaring/libvcalendar.php
+++ b/plugins/libcalendaring/libvcalendar.php
@@ -436,15 +436,17 @@ class libvcalendar implements Iterator
                 if (!$params['INTERVAL'])
                     $params['INTERVAL'] = 1;
 
-                $event['recurrence'] = $params;
+                $event['recurrence'] = array_filter($params);
                 break;
 
             case 'EXDATE':
-                $event['recurrence']['EXDATE'] = array_merge((array)$event['recurrence']['EXDATE'], self::convert_datetime($prop, true));
+                if (!empty($prop->value))
+                    $event['recurrence']['EXDATE'] = array_merge((array)$event['recurrence']['EXDATE'], self::convert_datetime($prop, true));
                 break;
 
             case 'RDATE':
-                $event['recurrence']['RDATE'] = array_merge((array)$event['recurrence']['RDATE'], self::convert_datetime($prop, true));
+                if (!empty($prop->value))
+                    $event['recurrence']['RDATE'] = array_merge((array)$event['recurrence']['RDATE'], self::convert_datetime($prop, true));
                 break;
 
             case 'RECURRENCE-ID':