[fix] useless import

models/account_invoice.py

@@ -2,7 +2,7 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from odoo import models, fields, api
-from odoo.exceptions import UserError
+
 
 class ScopAuraAccountInvoice(models.Model):
     _inherit = "account.invoice"