[*] BO : Correct the getList() request for quantity and id_product

Quantity and Id_product should be fixe as Int, else the Mysql request do something like : quantity LIKE "%0%"

When an admin key-in quantity as 0, he want product with quantity as 0, not as 0 / 10 /20 / 30... ect (The same for id_product)
Merge pull request #540 from axometeam/patch-7

[*] BO : Correct the getList() request for quantity and id_product