fix: use get instead of dot operator to access dict value

(cherry picked from commit 7fb75f0482)

erpnext/controllers/stock_controller.py

@@ -774,7 +774,7 @@ class StockController(AccountsController):
 				if row.get("batch_no"):
 					update_values["batch_no"] = None
 
-				if row.serial_and_batch_bundle:
+				if row.get("serial_and_batch_bundle"):
 					update_values["serial_and_batch_bundle"] = None
 					frappe.db.set_value(
 						"Serial and Batch Bundle", row.serial_and_batch_bundle, {"is_cancelled": 1}