If reading location from `persist.vendor.fingerprint.optical.sensorlocation` ever fails or prop is malformed, then the code will crash in this line: ParseInt(size, &props.sensorLocations[0].sensorRadius) Avoid that by ensuring that `props.sensorLocations` is not empty. Change-Id: I31a43f97e526fa8b7e6ec2080932cfb5552e237f