App crashes when creating event with RecurrenceRule(null)

[Jonny5-5]

Describe the bug
When I create an event with recurrence, but the recurrence object is RecurrenceRule(null) the app crashes.
Android and iOS

To Reproduce
Steps to reproduce the behavior:

var event = Event(
  calendar,
  title: "Title",
  start: startTime,
  end: endTime,
  recurrenceRule: RecurrenceRule(null),
);

var result = await _deviceCalendarPlugin.createOrUpdateEvent(event);

Expected behavior
Create an event with no Recurrence. Change RecurrenceFrequency to be non-nullable or change the handling of it to not use recurrence if RecurrenceFrequency is null.

Flutter doctor
[√] Flutter (Channel stable, 3.22.0, on Microsoft Windows [Version 10.0.22631.3593], locale en-US)
[√] Windows Version (Installed version of Windows is version 10 or higher)
[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[√] Chrome - develop for the web
[!] Visual Studio - develop Windows apps (Visual Studio Build Tools 2019 16.11.32)
X The current Visual Studio installation is incomplete.
Please use Visual Studio Installer to complete the installation or reinstall Visual Studio.
[√] Android Studio (version 2022.3)
[√] VS Code (version 1.90.0)
[√] Connected device (4 available)
[√] Network resources

[thomassth]

I believe you can just omit the recurrenceRule property altogether?

[Jonny5-5]

True, but if putting null into RecurrenceRule will crash the app, it would be nice if the field was non-nullable.