[Fix] Minor issue in landed cost voucher

erpnext/stock/doctype/landed_cost_voucher/landed_cost_voucher.py

@@ -12,6 +12,7 @@ class LandedCostVoucher(Document):
 	def get_items_from_purchase_receipts(self):
 		self.set("items", [])
 		for pr in self.get("purchase_receipts"):
+			if pr.receipt_document_type and pr.receipt_document:
 				pr_items = frappe.db.sql("""select pr_item.item_code, pr_item.description,
 					pr_item.qty, pr_item.base_rate, pr_item.base_amount, pr_item.name
 					from `tab{doctype} Item` pr_item where parent = %s