createActiveNullableModel<T> function
createActiveNullableModel Create a nullable value An ActiveModel can take the nature of any any object type. When an update is done an ActiveStateChanged event is triggered which in-turn makes a UI rebuild of that widget.
Example
late final ActiveModel<String?> name;
name = createNullProperty();
Implementation
ActiveModel<T?> createActiveNullableModel<T>({String? typeName}) {
return createActiveModel(null, typeName: typeName);
}