If the current working directory or the realpath could not be retrieved, return the path as it was passed to mp_normalize_path() to avoid guarding the return value. This is also makes it consistent with what the Windows code was doing.
If the current working directory or the realpath could not be retrieved, return the path as it was passed to mp_normalize_path() to avoid guarding the return value. This is also makes it consistent with what the Windows code was doing.