bugfix: don't cast min_sale_qty to int as it can be a decimal

[mageconsult]

Description (*)

With Magento 1.9.4.2 there was a small change in
app/design/adminhtml/default/default/template/catalog/product/tab/inventory.phtml.

When selling products with is_qty_decimal set to true, it is possible to sell units lower than one.

Here an example from an actual product in frontend

Backend when creating product

When creating a product in backend, this will first be save correctly.

With next edit it will be casted to integer and the decimal part will be cutted of. A min_sale_qty with 0.25 for example will be casted to 0.

With this fix the old version will be introduced again.

Manual testing scenarios (*)

1. enable is_qty_decimal in product
2. enter qty of 1.5
3. set min_sale_qty to 0.25
4. save and continue edit
5. min_sale_qty now is still 0.25 (instead of 0)

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)

[joshua-bn]

Probably would've been better to cast it to a float instead of nothing. Now it could be a non-scalar value or a non-numeric string.

edit: missed the *1. Still, not very explicit why that's there. Should use (float) instead.