allow version checking on empty DB
allow version checking on empty DB

Ziftr/counterpartyd,ClearingHouse/clearinghoused,Ziftr/counterpartyd,gotcha/testcounter,Czarparty/czarpartyd,Bluejudy/bluejudyd,monaparty/counterparty-lib,Bluejudy/bluejudyd,F483/counterparty-lib,paytokens-beta/paytokensd,Peertokens/peertokensd,monaparty/counterparty-lib,Litetokens/litetokensd,Metronote/metronotesd-alpha,Paytokens/paytokensd,CounterpartyXCP/counterparty-lib,stefcrypto/counterparty-lib,patricklodder/dogepartyd,coinwarp/dogeparty-lib,Reddcraft/reddcraftd,ClearingHouse/clearinghoused,tokenly/counterparty-lib,Dogeparty/dogepartyd,Dogeparty/dogepartyd,metronotes-beta/metronotesd,Tetchain/tetchaind,jarymoth/counterpartyd,F483/counterparty-lib,CounterpartyXCP/counterparty-lib,Tetchain/tetchaind,Reddcraft/reddcraftd