- _panel, columns, bind (&Config::kdm_cc, Config::instance()), bind (&Config::set_kdm_cc, Config::instance(), _1), bind (&column, _1)
+ _panel,
+ columns,
+ bind (&Config::kdm_cc, Config::instance()),
+ bind (&Config::set_kdm_cc, Config::instance(), _1),
+ bind (&string_not_empty, _1),
+ bind (&column, _1)