code: protected boolean blank(String ... names){
          //TODO: write test, move elsewhere - some helper
          for(String name:names){
              if(Util.blank(param(name))){
                  return true;
              }
          }
          return false;
      }
docs: Returns true if any named request parameter is blank.
  
  @param names names of request parameters.
  @return true if any request parameter is blank.