Minor improvements to sub-resource list

editor/scene_tree_dock.cpp

@@ -3578,6 +3578,13 @@ void SceneTreeDock::_list_all_subresources(PopupMenu *p_menu) {
 			p_menu->set_item_metadata(-1, pair.first->get_instance_id());
 		}
 	}
+
+	if (resources_by_type.is_empty()) {
+		p_menu->add_item(TTR("None"));
+		p_menu->set_item_disabled(-1, true);
+	}
+
+	p_menu->reset_size();
 }
 
 void SceneTreeDock::_gather_resources(Node *p_node, List<Pair<Ref<Resource>, Node *>> &r_resources) {