gdbus-wrapper: Guard against emitting signals when object isn't exported
g_dbus_interface_skeleton_get_connection() can return null if the object isn't exported on the bus. In those cases, refrain from trying to emit signals.
Closes: #332 (closed)
g_dbus_interface_skeleton_get_connection() can return null if the object isn't exported on the bus. In those cases, refrain from trying to emit signals.
Closes: #332 (closed)