response message for user have empty subscriptions
response message for user have empty subscriptions

liam-lai/ptt-alertor,meifamily/ptt-alertor,liam-lai/ptt-alertor,meifamily/ptt-alertor,meifamily/ptt-alertor,liam-lai/ptt-alertor,liam-lai/ptt-alertor,meifamily/ptt-alertor