[FIX] mrp: potential traceback
[FIX] mrp: potential traceback

- Create a MO for 500 Units
- Produce 500 Units
- In the "Finished Products" tab, change the produced quantity to 450

At that point, the button "Mark As Done" doesn't appear anymore.
Therefore, we need to change the "Quantity To Produce" to 450 => This
causes a traceback because of a division by zero.

Fixes #14499
opw-695269

hip-odoo/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,dfang/odoo,dfang/odoo,dfang/odoo,ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo