### Godot version

4.0 beta (e1648b3327431a09cc9498663fac483275eb711d)

### System information

Mageia 9, Linux

### Issue description

When exporting a project with no attached script (or with only a builtin GDScript), the following error is printed:
```
ERROR: Can't open file from path 'res://.godot/global_script_class_cache.cfg'.
   at: get_file_as_bytes (core/io/file_access.cpp:699)
```

And while the export succeeds, when running the project, it prints:
```
ERROR: Couldn't find the given section "" and key "list", and no default was given.
   at: get_value (core/io/config_file.cpp:86)
```

We should ensure that this file is always created, regardless of whether there are scripts to parse for class names or not. It should always contain at least `list=[]`.

### Steps to reproduce

- Create new project
- Create main scene with no script
- Export

### Minimal reproduction project

[NewProj.zip](https://github.com/godotengine/godot/files/10547125/NewProj.zip)
int fc = d->get_file_count();
	for (int i = 0; i < fc; i++) {
		if (d->get_file_type(i) == SNAME("GDExtension")) {
			extensions.insert(d->get_file_path(i));
		}
	}
	int dc = d->get_subdir_count();
	for (int i = 0; i < dc; i++) {
		_scan_extensions_dir(d->get_subdir(i), extensions);
	}
}
bool EditorFileSystem::_scan_extensions() {