[hotfix] Make duty cycles available and set to 0 when no data is available on gateway
[hotfix] Make duty cycles available and set to 0 when no data is available on gateway

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