Fixes: 1) Handle case where no feedback exists for an order product in resolve_feedback.

Extra: 1) Adjust logic for `resolve_feedback` to safely return the first feedback or `None`.

core/graphene/object_types.py

@@ -416,7 +416,8 @@ class OrderProductType(DjangoObjectType):
         description = _("order products")
 
     def resolve_feedback(self: OrderProduct, _info):
-        return Feedback.objects.get(order_product=self)
+        feedbacks = Feedback.objects.filter(order_product=self)
+        return feedbacks.first() if feedbacks.exists() else None
 
     def resolve_attributes(self, _info):
         return camelize(self.attributes)