[minor] don't display missing file doc message in item's make thumbnail
diff --git a/erpnext/stock/doctype/item/item.py b/erpnext/stock/doctype/item/item.py
index 99f6417..9c4ccdc 100644
--- a/erpnext/stock/doctype/item/item.py
+++ b/erpnext/stock/doctype/item/item.py
@@ -98,6 +98,8 @@
 				})
 			except frappe.DoesNotExistError:
 				pass
+				# cleanup
+				frappe.local.message_log.pop()
 
 			# for CSV import
 			if not file_doc: