[DO NOT MERGE] fingerprint: handle PerformanceStats NULL pointers am: 3615be74c1 am: eea53b512c am: 3f78dbf336

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1439198

Change-Id: Ie6a99f4a026e972aaf1036cf44edaf52a0510220