don't emit signal when there is no logging
don't emit signal when there is no logging

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