[FIX] account/purchase: onchange on purchase create bill does not work

closes odoo/odoo#64777

X-original-commit: 0f36bbd257ba5e8e03462f675d81fdbdece1893a
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>

addons/account/models/account_move.py

@@ -943,7 +943,8 @@ class AccountMove(models.Model):
             # Recompute amls: update existing line or create new one for each payment term.
             new_terms_lines = self.env['account.move.line']
             for date_maturity, balance, amount_currency in to_compute:
-                if self.journal_id.company_id.currency_id.is_zero(balance) and len(to_compute) > 1:
+                currency = self.journal_id.company_id.currency_id
+                if currency and currency.is_zero(balance) and len(to_compute) > 1:
                     continue
 
                 if existing_terms_lines_index < len(existing_terms_lines):

addons/purchase/models/account_invoice.py

@@ -15,7 +15,7 @@ class AccountMove(models.Model):
         states={'draft': [('readonly', False)]},
         string='Purchase Order',
         help="Auto-complete from a past purchase order.")
-    
+
     def _get_invoice_reference(self):
         self.ensure_one()
         vendor_refs = [ref for ref in set(self.line_ids.mapped('purchase_line_id.order_id.partner_ref')) if ref]