### Godot version

4.1.dev

### System information

Win11

### Issue description

I load a non-existing GDScript, but it still returns a valid instance instead of null.
```gdscript
@tool
extends EditorScript

func _run():
	var s = ResourceLoader.load("non_exists.gd", "", ResourceLoader.CACHE_MODE_IGNORE)
	print(s)
	assert(s == null)

```

```
  Attempt to open script 'res://non_exists.gd' resulted in error 'File not found'.
<GDScript#-9223369015982753437>
  res://new_script.gd:7 - Assertion failed.

```

### Steps to reproduce

N/A

### Minimal reproduction project

N/A
{
		HashMap<StringName, GDScript::MemberInfo>::Iterator E = script->member_indices.find(p_name);
		if (E) {
			const GDScript::MemberInfo *member = &E->value;
			Variant value = p_value;
			if (member->data_type.has_type && !member->data_type.is_type(value)) {
				const Variant *args = &p_value;
				Callable::CallError err;
				Variant::construct(member->data_type.builtin_type, value, &args, 1, err);
				if (err.error != Callable::CallError::CALL_OK || !member->data_type.is_type(value)) {
					return false;