Ensure person gets added even if the fingerprint did not work

fingerprints are generated from nomenklatura
if the person is not yet added to nomenklatura this resolve will fail
ensure that the person is added anyway and gets updated later
Make sure persons update does not crash

if politician is not in nomenklatura this might break
make sure it is catched
Log warnings and catch error in person reference
Merge pull request #37 from okfde/updater-persons

Persons update fixes