[FIX] web: mock server was replacing "falsy" values with default ones
[FIX] web: mock server was replacing "falsy" values with default ones

When setting a field value to "0", the mock server was replacing it
with the field default value as "0" is a falsy value. Now it only
adds the default values where there is no value at all, as expected.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo