### 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)
Error error = save_custom(get_resource_path().path_join("project.godot"));
	if (error == OK) {
		last_save_time = FileAccess::get_modified_time(get_resource_path().path_join("project.godot"));
	}
	return error;
}
Error ProjectSettings::_save_settings_binary(const String &p_file, const RBMap<String, List<String>> &p_props, const CustomMap &p_custom, const String &p_custom_features) {
	Error err;
	Ref<FileAccess> file = FileAccess::open(p_file, FileAccess::WRITE, &err);
	ERR_FAIL_COND_V_MSG(err != OK, err, "Couldn't save project.binary at " + p_file + ".");
	uint8_t hdr[4] = { 'E', 'C', 'F', 'G' };
	file->store_buffer(hdr, 4);
	int count = 0;
	for (const KeyValue<String, List<String>> &E : p_props) {
		count += E.value.size();
	}
	if (!p_custom_features.is_empty()) {
		file->store_32(count + 1);
		
		String key = CoreStringNames::get_singleton()->_custom_features;
		file->store_pascal_string(key);
		int len;
		err = encode_variant(p_custom_features, nullptr, len, false);
		ERR_FAIL_COND_V(err != OK, err);
		Vector<uint8_t> buff;
		buff.resize(len);
		err = encode_variant(p_custom_features, buff.ptrw(), len, false);
		ERR_FAIL_COND_V(err != OK, err);
		file->store_32(len);
		file->store_buffer(buff.ptr(), buff.size());