function maybe_disable_link_manager() {
  global $wp_current_db_version, $wpdb;

  if ( $wp_current_db_version >= 22006 && get_option( 'link_manager_enabled' ) && ! $wpdb->get_var( "SELECT link_id FROM $wpdb->links LIMIT 1" ) ) {
    update_option( 'link_manager_enabled', 0 );
  }
}