fixed steps_string to show product only if product is there in retrieval

app/chatbot/demo_rag.py

@@ -169,7 +169,11 @@ def generate_answer(state: GraphState):
     steps_string = "\n".join(
         f"{tool_name} Results:\n" +
         "\n".join(
-            f"- Product: {entry.get('metadata', {}).get('product_name', 'N/A')}\n  {entry['content']}" 
+            (f"- Product: {entry['metadata']['product_name']}\n  {entry['content']}"
+                if entry.get("metadata", {}).get("product_name")
+                else f"- {entry['content']}"
+            )
+
             for entry in results
         )
         for tool_name, results in intermediate_steps.items() if results