theme_location ) || empty( ! empty( $_wp_registered_nav_menus[ $args->theme_location ] ) ) ) : ?>

<?php quadmenu(array(theme_location => "%1$s")); ?>', key( $_wp_registered_nav_menus ) ); ?>

Configuration tab and activate the %2$s theme location.', 'quadmenu' ), Plugin::taburl( '0' ), $_wp_registered_nav_menus[ $args->theme_location ] ); ?>