[FIX] base: ir.sequence better fallback
[FIX] base: ir.sequence better fallback

Zero is an non-acceptable value for sequences, so the fallback should be
one instead.

Fixes #21267
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo