fix null fingerprint issue
fix null fingerprint issue

bitstopco/lamassu-machine-old,evan82/lamassu-machine,lamassu/lamassu-machine,evan82/lamassu-machine,bitstopco/lamassu-machine-old,lamassu/lamassu-machine,lamassu/lamassu-machine,lamassu/lamassu-machine,evan82/lamassu-machine,bitstopco/lamassu-machine-old,evan82/lamassu-machine,bitstopco/lamassu-machine-old