Fix use of cConnection smart_ptr in ServerHandler
Fix use of cConnection smart_ptr in ServerHandler

Kicking a user from the server directly in userConnected
resulted in a clientside crash. sendPing dereferenced the
cConnection smart_ptr directly without making sure it actually
exists. cConnection was already cleared at this point resulting
in a crash/boost assertion being hit.

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