[FIX] account: randomize invoice reference if no match
[FIX] account: randomize invoice reference if no match

Take explanation of
commit d94e8a0
but this time, have a suffix with a flavor of %(year)s

Before this commit, validating the invoice crashes

After this commit it doesn't.

OPW 1912954

closes odoo/odoo#29160
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo