[Autofill Framework] Add in null check before further processing inline request for augmented.

getRemoteAugmentedAutofillServiceLocked() can return null when there is no augmented autofill service set. We should add a null check here to prevent null pointer exception.

Bug: b/427159531
Test: atest CtsAutoFillServiceTestCases
Flag: android.service.autofill.add_null_check_for_augmented_inline_request
Change-Id: I46fde744385db9a10fbd993bf1d1fcb892bdb486