protect against null socket
protect against null socket

unisontech/qxmpp,ycsoft/qxmpp,projedi/qxmpp-ffmpeg,gotomypc/qxmpp,gamenet/qxmpp_old,olesalscheider/qxmpp,cccco/qxmpp,unisontech/qxmpp,pol51/QXMPP-CMake,LightZam/qxmpp,trulabs/qxmpp-old,kollix/qxmpp,deepak899/qxmpp,Kaffeine/qxmpp,kollix/qxmpp,Ilyatk/qxmpp,gamenet/qxmpp,pol51/QXMPP-CMake,Ilyatk/qxmpp,gamenet/qxmpp,deepak899/qxmpp,Kaffeine/qxmpp,LightZam/qxmpp,LightZam/qxmpp,deepak899/qxmpp,Kaffeine/qxmpp,projedi/qxmpp-ffmpeg,ycsoft/qxmpp,olesalscheider/qxmpp,pol51/QXMPP-CMake,unisontech/qxmpp,Ilyatk/qxmpp,ycsoft/qxmpp,trulabs/qxmpp-old,KangLin/qxmpp,gamenet/qxmpp,cccco/qxmpp,gamenet/qxmpp_old,gotomypc/qxmpp,trulabs/qxmpp-old,kollix/qxmpp,KangLin/qxmpp,cccco/qxmpp,gamenet/qxmpp_old,olesalscheider/qxmpp,KangLin/qxmpp,gotomypc/qxmpp