docs: public File getFirstExistingDirectory(String param) {
      final List<String> directoryStrings = getStringList(param);
      for (final String dirName : directoryStrings) {
        final File dir = new File(dirName.trim());
        if (dir.isDirectory()) {
          return dir;
        }
      }
  
      throw new ParameterConversionException(fullString(param), directoryStrings.toString(),
          "No provided path is an existing directory");
    }