Fix potential crash when listing leaked objects

Note:
Casting to the C++ classes and calling the methods there would work as well,
but would require including he header files for the specific object types handled
here, which wouldn't be OK either.

core/object.cpp

@@ -2134,15 +2134,22 @@ void ObjectDB::cleanup() {
 
 		WARN_PRINT("ObjectDB instances leaked at exit (run with --verbose for details).");
 		if (OS::get_singleton()->is_stdout_verbose()) {
+			// Ensure calling the native classes because if a leaked instance has a script
+			// that overrides any of those methods, it'd not be OK to call them at this point,
+			// now the scripting languages have already been terminated.
+			MethodBind *node_get_name = ClassDB::get_method("Node", "get_name");
+			MethodBind *resource_get_path = ClassDB::get_method("Resource", "get_path");
+			Variant::CallError call_error;
+
 			const ObjectID *K = NULL;
 			while ((K = instances.next(K))) {
 
-				String node_name;
+				String extra_info;
 				if (instances[*K]->is_class("Node"))
-					node_name = " - Node name: " + String(instances[*K]->call("get_name"));
+					extra_info = " - Node name: " + String(node_get_name->call(instances[*K], NULL, 0, call_error));
 				if (instances[*K]->is_class("Resource"))
-					node_name = " - Resource path: " + String(instances[*K]->call("get_path"));
-				print_line("Leaked instance: " + String(instances[*K]->get_class()) + ":" + itos(*K) + node_name);
+					extra_info = " - Resource path: " + String(resource_get_path->call(instances[*K], NULL, 0, call_error));
+				print_line("Leaked instance: " + String(instances[*K]->get_class()) + ":" + itos(*K) + extra_info);
 			}
 			print_line("Hint: Leaked instances typically happen when nodes are removed from the scene tree (with `remove_child()`) but not freed (with `free()` or `queue_free()`).");
 		}