* #7101: fixed segfault in daemon on conference hangup.

daemon/src/audio/audiortp/AudioRtpSession.cpp

daemon/src/conference.cpp

daemon/src/conference.h

daemon/src/dbus/callmanager.cpp

daemon/src/managerimpl.cpp

daemon/src/managerimpl.h

gnome/src/accountlist.c

gnome/src/accountlist.h

gnome/src/actions.c

gnome/src/callable_obj.c

gnome/src/callable_obj.h

gnome/src/conference_obj.c

gnome/src/contacts/calllist.c

gnome/src/contacts/calltab.h

gnome/src/contacts/calltree.c

gnome/src/contacts/calltree.h

gnome/src/contacts/conferencelist.c

gnome/src/contacts/conferencelist.h

gnome/src/contacts/searchbar.c

gnome/src/dbus/dbus.c