* #10736: gnome: fix crash on restart with active conference

daemon/src/dbus/callmanager-introspec.xml

daemon/src/managerimpl.cpp

gnome/src/actions.c

gnome/src/callable_obj.c

gnome/src/conference_obj.c

gnome/src/contacts/calllist.c

gnome/src/contacts/calllist.h

gnome/src/contacts/calltree.c

gnome/src/dbus/callmanager-introspec.xml

gnome/src/dbus/dbus.c

gnome/src/main.c

gnome/src/mainwindow.c