Can open event creation dialog even if no calendars enabled but "Create Event " fails silently

I have searched open and closed issues for duplicates.

## Describe the bug
If there are no calendars enabled it is still possible to open the event dialog and try to add event. However, pressing "Create Event" does not create any event.

### Expected behavior
Event creation buttons/shortcuts should be disabled if it is not possible to successfully create an event, because there are no active calendars or for some other reason. Alternatively an attempt to create an event should trigger an informative warning.

## Platform Information
Hera daily.

I'm using the latest version of Calendar from git that I've manually compiled