Fix authentication callback nullability issues#6
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The methods of the
FingerprintManager.AuthenticationCallbackandBiometricPrompt.AuthenticationCallbackclasses do not have nullability annotations / markers on them, and theCharSequenceparameters have been treated as non-nullable.Turns out, on some devices in some situations the
CharSequenceparameter passed can be null.This PR fixes the implicit non-null force for the parameter and passes along an empty string in that case.