[hotfix] Add logs to handler + avoid pulling from down packets when no gateway is available
[hotfix] Add logs to handler + avoid pulling from down packets when no gateway is available

mgranberry/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,TheThingsNetwork/ttn,mgranberry/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,jvanmalder/ttn,TheThingsNetwork/ttn,mgranberry/ttn,LoRaWanSoFa/ttn