protect against the case where the user has removed the disco manager
protect against the case where the user has removed the disco manager

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