// Check preferences setting
if ( CRM_Core_BAO_Setting::getItem( CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'activity_assignee_notification_ics' ) ) {
$config = &CRM_Core_Config::singleton();
// Check preferences setting
if ( CRM_Core_BAO_Setting::getItem( CRM_Core_BAO_Setting::SYSTEM_PREFERENCES_NAME, 'activity_assignee_notification_ics' ) ) {
$config = &CRM_Core_Config::singleton();