### 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
clear_data->functions.insert(implicit_ready);
		implicit_ready = nullptr;
	}
	if (static_initializer) {
		clear_data->functions.insert(static_initializer);
		static_initializer = nullptr;
	}
	_save_orphaned_subclasses(clear_data);
#ifdef TOOLS_ENABLED
	
	if (_owner) {
		_clear_doc();
	}
#endif
	
	if (is_root) {
		
		for (GDScriptFunction *E : clear_data->functions) {
			memdelete(E);
		}
		for (Ref<Script> &E : clear_data->scripts) {
			Ref<GDScript> gdscr = E;
			if (gdscr.is_valid()) {
				GDScriptCache::remove_script(gdscr->get_path());
			}
		}
		clear_data->clear();
	}
}
GDScript::~GDScript() {