REFACTOR: Clean up DB handling in NotficationsDB.Put and prevent panic.
REFACTOR: Clean up DB handling in NotficationsDB.Put and prevent panic.

gubatron/openbazaar-go,duomarket/openbazaar-test-nodes,hoffmabc/openbazaar-go,hoffmabc/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,duomarket/openbazaar-test-nodes,gubatron/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,hoffmabc/openbazaar-go,duomarket/openbazaar-test-nodes