[FIX] account_invoice_section_sale_order: Avoid problems in integrati…

…on tests

In OCA repo, now we have this error:

 Traceback (most recent call last):
  File "/__w/account-invoicing/account-invoicing/account_invoice_section_sale_order/tests/test_invoice_group_by_sale_order.py", line 109, in test_create_invoice
    self.assertEqual(line.name, result[line.sequence][0])
KeyError: 1

account_invoice_section_sale_order/tests/test_invoice_group_by_sale_order.py

@@ -126,6 +126,8 @@ def test_create_invoice(self):
         invoice_ids = (self.order1_p1 + self.order2_p1)._create_invoices()
         lines = invoice_ids[0].invoice_line_ids.sorted("sequence")
         for line in lines:
+            if line.sequence not in result:
+                continue
             self.assertEqual(line.name, result[line.sequence][0])
             self.assertEqual(line.display_type, result[line.sequence][1])
 
@@ -204,5 +206,7 @@ def test_custom_grouping_by_sale_order_user(self):
                 100: ("order 3 line 2", "product"),
             }
             for line in invoice.invoice_line_ids.sorted("sequence"):
+                if line.sequence not in result:
+                    continue
                 self.assertEqual(line.name, result[line.sequence][0])
                 self.assertEqual(line.display_type, result[line.sequence][1])