Fix possible crash in MainWindow::talkingChanged()
Fix possible crash in MainWindow::talkingChanged()

chiefdome/mumble-code,LuAPi/mumble,Lartza/mumble,unascribed/mumble,mkrautz/mumble-sbcelt,Keridos/mumble,niko20010/mumble,Zopieux/mumble,mbax/mumble,feld/mumble,Lartza/mumble,Zopieux/mumble,panaschieren/mumble-test,panaschieren/mumble-test,mkrautz/mumble-sbcelt,Natenom/mumble,austinliou/mumble,Natenom/mumble,Zopieux/mumble,LuAPi/mumble,richard227/mumble,mbax/mumble,ccpgames/mumble,Keridos/mumble,austinliou/mumble,LuAPi/mumble,Githlar/mumble,panaschieren/mumble-test,chancegarcia/mumble,Lartza/mumble,chiefdome/mumble-code,chancegarcia/mumble,mkrautz/mumble-sbcelt,Natenom/mumble,LuAPi/mumble,ccpgames/mumble,panaschieren/mumble-test,chiefdome/mumble-code,ccpgames/mumble,Natenom/mumble,Keridos/mumble,mbax/mumble,mbax/mumble,richard227/mumble,niko20010/mumble,bheart/mumble,feld/mumble,niko20010/mumble,feld/mumble,austinliou/mumble,unascribed/mumble,ccpgames/mumble,mkrautz/mumble-sbcelt,feld/mumble,feld/mumble,Lartza/mumble,ccpgames/mumble,mkrautz/mumble-sbcelt,Keridos/mumble,unascribed/mumble,niko20010/mumble,LuAPi/mumble,chiefdome/mumble-code,Keridos/mumble,bheart/mumble,panaschieren/mumble-test,SuperNascher/mumble,mbax/mumble,Githlar/mumble,mbax/mumble,richard227/mumble,Githlar/mumble,mkrautz/mumble-sbcelt,austinliou/mumble,niko20010/mumble,Githlar/mumble,Githlar/mumble,bheart/mumble,Natenom/mumble,bheart/mumble,SuperNascher/mumble,chiefdome/mumble-code,Lartza/mumble,unascribed/mumble,bheart/mumble,bheart/mumble,LuAPi/mumble,Natenom/mumble,Natenom/mumble,Zopieux/mumble,richard227/mumble,chancegarcia/mumble,chancegarcia/mumble,LuAPi/mumble,austinliou/mumble,Lartza/mumble,chiefdome/mumble-code,feld/mumble,panaschieren/mumble-test,unascribed/mumble,feld/mumble,LuAPi/mumble,ccpgames/mumble,chancegarcia/mumble,unascribed/mumble,SuperNascher/mumble,niko20010/mumble,richard227/mumble,Zopieux/mumble,ccpgames/mumble,chancegarcia/mumble,panaschieren/mumble-test,SuperNascher/mumble,Githlar/mumble,Zopieux/mumble,SuperNascher/mumble,mbax/mumble,niko20010/mumble,mkrautz/mumble-sbcelt,Githlar/mumble,SuperNascher/mumble,chancegarcia/mumble,LuAPi/mumble,chancegarcia/mumble,panaschieren/mumble-test,ccpgames/mumble,SuperNascher/mumble,Keridos/mumble,SuperNascher/mumble,feld/mumble,richard227/mumble,austinliou/mumble,Githlar/mumble,austinliou/mumble,niko20010/mumble,austinliou/mumble,Lartza/mumble,chiefdome/mumble-code,Natenom/mumble,Zopieux/mumble,bheart/mumble,SuperNascher/mumble,mbax/mumble,bheart/mumble,mkrautz/mumble-sbcelt,richard227/mumble,chiefdome/mumble-code,richard227/mumble,Keridos/mumble,chancegarcia/mumble,unascribed/mumble,unascribed/mumble,Lartza/mumble,Zopieux/mumble,Keridos/mumble