[fix] remove return

models/sale_intervention.py

@@ -124,5 +124,6 @@ class SaleIntervention(models.Model):
                         )
                         for sol in sols:
                             self.env["sale.order.line"].create(sol)
+
             else:
-                return super(SaleIntervention, self)._update_order_lines()
+                super(SaleIntervention, self)._update_order_lines()