Check before calling schedule_pricing_update (#7871) (#7872)

Ref: https://github.com/inventree/InvenTree/pull/7807#issuecomment-2287770192
(cherry picked from commit 697ab1653a)

Co-authored-by: Oliver <oliver.henry.walters@gmail.com>

src/backend/InvenTree/order/models.py

@@ -1105,6 +1105,7 @@ class SalesOrder(TotalPriceMixin, Order):
 
         # Schedule pricing update for any referenced parts
         for line in self.lines.all():
+            if line.part:
                 line.part.schedule_pricing_update(create=True)
 
         trigger_event('salesorder.completed', id=self.pk)

src/backend/InvenTree/part/models.py

@@ -4510,6 +4510,7 @@ def update_pricing_after_edit(sender, instance, created, **kwargs):
     """Callback function when a part price break is created or updated."""
     # Update part pricing *unless* we are importing data
     if InvenTree.ready.canAppAccessDatabase() and not InvenTree.ready.isImportingData():
+        if instance.part:
             instance.part.schedule_pricing_update(create=True)
 
 
@@ -4526,6 +4527,7 @@ def update_pricing_after_delete(sender, instance, **kwargs):
     """Callback function when a part price break is deleted."""
     # Update part pricing *unless* we are importing data
     if InvenTree.ready.canAppAccessDatabase() and not InvenTree.ready.isImportingData():
+        if instance.part:
             instance.part.schedule_pricing_update(create=False)
 
 

src/backend/InvenTree/stock/models.py

@@ -2293,6 +2293,7 @@ def after_delete_stock_item(sender, instance: StockItem, **kwargs):
         )
 
         # Schedule an update on parent part pricing
+        if instance.part:
             instance.part.schedule_pricing_update(create=False)
 
 
@@ -2312,6 +2313,7 @@ def after_save_stock_item(sender, instance: StockItem, created, **kwargs):
         )
 
         # Schedule an update on parent part pricing
+        if instance.part:
             instance.part.schedule_pricing_update(create=True)