berths was empty

        SELECT `V`.`berths`,
            COUNT(`V`.`vehicle_id`) as num
        FROM `vehicle` `V`
        LEFT JOIN category_has_vehicle chv ON chv.vehicle_id = V.vehicle_id
        LEFT JOIN vehicle_has_layout vhl on V.vehicle_id = vhl.vehicle_id
        WHERE `V`.`berths` != ''
        
        
         AND chv.category_id = 4
        
        
        
        
        
        AND `V`.`price` > 0
        GROUP BY `V`.`berths`
        ORDER BY `V`.`berths` ASC