Handle missing FingerprintManager.

getSystemService() is documented to possibly return null, so check
the return values before using.

Test: builds
Bug: 32566669
Change-Id: I0627ddf1c936c618bb91a2a6ac218fe7591a40e9
(cherry picked from commit ab34867f85874fbdc1d1dc5aa968278b7ba0b4ca)
1 file changed