docs: public ConfigurationItem getConfigurationItemByClOpt(final String clopt) {
      if(clopt==null || clopt.trim().isEmpty()) throw new IllegalArgumentException("The passed cl-opt was null or empty");
      for(final ConfigurationItem ci: configItemsByCl) {
        if(ci.getClOption().equals(clopt)) return ci;
      }
      return null;
  
    }