fix: Validate if item exists on uploading items in stock reco (#27538)

* fix: Validate if item exists on uploading items in stock reco

- Uploading non existent item in stock reco and then changing warehouse or batch gave an error
- Check for non existent item

* chore: translation

Co-authored-by: Ankush Menat <ankushmenat@gmail.com>

erpnext/stock/doctype/stock_reconciliation/stock_reconciliation.py

@@ -619,6 +619,11 @@ def get_stock_balance_for(item_code, warehouse,
 	item_dict = frappe.db.get_value("Item", item_code,
 		["has_serial_no", "has_batch_no"], as_dict=1)
 
+	if not item_dict:
+		# In cases of data upload to Items table
+		msg = _("Item {} does not exist.").format(item_code)
+		frappe.throw(msg, title=_("Missing"))
+
 	serial_nos = ""
 	with_serial_no = True if item_dict.get("has_serial_no") else False
 	data = get_stock_balance(item_code, warehouse, posting_date, posting_time,