[FIX] hr_expense: expense of zero
[FIX] hr_expense: expense of zero

Complement of commit cab436819f2f93b290b2401e769e72e16784a66e

Previous commit was not considering a complete expense sheet of zero.

opw-710695

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