This event is called when:
- After notifyViewEntered() when autofill is disabled.
- After service returns an "empty" FillResponse to FillCallback.onSuccess().
BUG: 36056207
Test: LoginActivityTest.testAutofillCallbackDisabled
Test: LoginActivityTest.testAutofillCallbackNoDatasets
Test: VirtualContainerActivityTest.testAutofillCallbackDisabled
Test: VirtualContainerActivityTest.testAutofillCallbackNoDatasets
Change-Id: I7b8636473f738bf600aa96b28c77827b2cc78815