[FIX] account: prevent traceback
[FIX] account: prevent traceback

When changing the date of an account move, the method
`_onchange_amount_currency` is called manually on a recordset. If the
recordset length is > 1, it crashes.

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