Skip listing.json migration if not exists
Skip listing.json migration if not exists

hoffmabc/openbazaar-go,gubatron/openbazaar-go,gubatron/openbazaar-go,hoffmabc/openbazaar-go,hoffmabc/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,gubatron/openbazaar-go