Added error.php
Merge pull request #1431 from kaltura/IX-9.19.0-Redirect-403-to-404

Added error.php
check if endTime is null before comparison
Merge pull request #1437 from kaltura/IX-9.19.0-SUP-2513-hot-fix

check if endTime is null before comparison
Merge pull request #1454 from kaltura/IX-9.19.0-EventNotificationEventType

Ix 9.19.0 event notification event type