fix sending response when no client socket available
fix sending response when no client socket available

kucukkanat/localtunnel-server,kucukkanat/localtunnel-server,kucukkanat/localtunnel-server,localtunnel/server,eguaj/localtunnel-server,defunctzombie/localtunnel-server,defunctzombie/localtunnel-server