Code review comment for lp:~artmello/ubuntu-calendar-app/ubuntu-calendar-app-fix_default_reminder

It is failing to edit event with no reminder:

1 - Create a event with no-reminder
2 - Save event and go back to the view
3 - Open the same event (event details will show it as no-reminder)
4 - Edit it

Expected:
The Reminder combo shows "no reminder"

Current:
The Reminder compo shows "15 minutes"