Merge "Add null check for fingerprint props" into udc-dev

     * not enrolled sfps. This may be false if called before onAllAuthenticatorsRegistered.

     */

    public boolean isRearFpsSupported() {

        if (mFpProps != null) {

            for (FingerprintSensorPropertiesInternal prop: mFpProps) {

                if (prop.sensorType == TYPE_REAR) {

                    return true;

                }

            }

        }

        return false;

    }