I just upgraded to v4.7.0M and Cron is emailing me an error message when lcalcron.php is run and there are reminders that need to be emailed:
Cron <root@serverl> php -q /var/www/webcal/lcalcron.php
PHP Notice: Undefined index: xda in /var/www/webcal/cronjobs/notify.php on line 39
Even though this error is generated, it appears that the reminders are emailed correctly.