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Allow mosby to support view without activity:
Reference ticket: #281
Alternatively, we can just remove the Exception when there is no activity and switch automatically to Window-mode for ViewGroup base DelegateCallback. But I guess if we add this feature we would like it to be enforced and managed.
So the user will need to implement "public boolean isViewOnActivity()"
It basically switch to a mod where it does not expect to save a state nor detach a view without destroying.
From a user perspective, a CustomView can be use alternatively by a Activity or a Window directly, an easy way to support that would be to implement:
public boolean isViewOnActivity() { return PresenterManager.getActivity(delegateCallback.getContext()) != null }