Don't accept null channelIDs
Don't accept null channelIDs

frsela/notification_server,telefonicaid/notification_server,telefonicaid/notification_server,telefonicaid/notification_server,telefonicaid/notification_server,frsela/notification_server,frsela/notification_server,frsela/notification_server,telefonicaid/notification_server,frsela/notification_server