def install_handler!(opts={}, &block)
      stat = find_stat(opts, &block)
      raise NoAvailableHandler unless stat
      stat.install
    end
def install_handler!(opts={}, &block)
      stat = find_stat(opts, &block)
      raise NoAvailableHandler unless stat
      stat.install
    end
like ::install_handler but throws an NoHandlerAvailable
 @see  ::install_hadler