Could reuse `Items.getConfigFile` method to avoid duplicating this constant.

Could also skip the `child.isDirectory()` check (saving a file stat), since certainly it is a directory if a file inside it exists. But to @daniel-beck’s concern, it would be better to first check if such a directory exists; and then if it does, but `config.xml` does not exist, log a one-line warning (which should be much less expensive than logging a full stack trace).