BuddyPress: Show users that do not have groups based on a get parameter

my_filter_user_query

/**
 * Filters the query
 * 
 * @param string $query The query instance
 * @param array $sql The array of the query to be run
 *
 * @return array
 **/
function bp_filter_member_query( $query, $sql ) {

	$key = 'group_id'; // the key to check agains

	$do_filter = isset($_GET[$key]) && $_GET[$key] === 'none' ? true : false; // should return true or false

	if( $do_filter ) {

		global $wpdb;

		$qry = "u.ID not in (
		    SELECT user_id FROM {$wpdb->usermeta}
		   where meta_key = 'total_group_count'
		   and meta_value != 0
		)";

		$query['where'][] = $qry;

	}

	return $query;

}

add_filter( 'bp_user_query_uid_clauses', 'bp_filter_member_query', 20, 2 );