Merge pull request #773 from hiltonm/fix-2d-spatial-audio

Remove camera check for 2D audio listener.

scene/main/viewport.cpp

@@ -558,7 +558,7 @@ void Viewport::_update_listener() {
 
 void Viewport::_update_listener_2d() {
 
-	if (is_inside_scene() && audio_listener && camera && (!get_parent() || (get_parent()->cast_to<Control>() && get_parent()->cast_to<Control>()->is_visible())))
+	if (is_inside_scene() && audio_listener && (!get_parent() || (get_parent()->cast_to<Control>() && get_parent()->cast_to<Control>()->is_visible())))
 		SpatialSound2DServer::get_singleton()->listener_set_space(listener_2d,find_world_2d()->get_sound_space());
 	else
 		SpatialSound2DServer::get_singleton()->listener_set_space(listener_2d,RID());