code: public Config getChild(String name)
    {
      Params.notNullOrEmpty(name, "Child name");
      for(Config child : children) {
        if(child.name.equals(name)) {
          return child;
        }
      }
      return null;
    }
docs: Get configuration object first child with requested name or null if there is no child with given name.
  
  @param name child name.
  @return configuration object child or null.
  @throws IllegalArgumentException if <code>name</code> argument is null or empty.