normalize cleaned data row with missing output

alpaca_data_cleaned.json

@@ -17781,7 +17781,8 @@
     },
     {
         "instruction": "Edit this sentence: The man wented to the store.",
-        "input": "The man wented to the store."
+        "input": "The man wented to the store.",
+        "output": "The man went to the store."
     },
     {
         "instruction": "Find out what year the company was founded.",