Merge pull request #26528 from bojidar-bg/26047-gdscript-object-argument

Allow parameters passed to GDScript functions to be nulled

modules/gdscript/gdscript_function.cpp

@@ -329,10 +329,15 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 					}
 
 					if (!argument_types[i].is_type(*p_args[i], true)) {
-						r_err.error = Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
-						r_err.argument = i;
-						r_err.expected = argument_types[i].kind == GDScriptDataType::BUILTIN ? argument_types[i].builtin_type : Variant::OBJECT;
-						return Variant();
+						if (argument_types[i].is_type(Variant(), true)) {
+							memnew_placement(&stack[i], Variant);
+							continue;
+						} else {
+							r_err.error = Variant::CallError::CALL_ERROR_INVALID_ARGUMENT;
+							r_err.argument = i;
+							r_err.expected = argument_types[i].kind == GDScriptDataType::BUILTIN ? argument_types[i].builtin_type : Variant::OBJECT;
+							return Variant();
+						}
 					}
 					if (argument_types[i].kind == GDScriptDataType::BUILTIN) {
 						Variant arg = Variant::construct(argument_types[i].builtin_type, &p_args[i], 1, r_err);