Update app.py

app.py

@@ -293,7 +293,19 @@ with gr.Blocks(theme=gr.themes.Soft(), title="💬 Level 0 IT Support Chatbot")
         global chat_history
         dense_retriever.similarity_top_k = k
         bm25_retriever.similarity_top_k = k
-        reply, context_nodes = chat(message, temperature=temp, top_p=top_p)
+    
+        # Call the chat function and get its return value
+        chat_result = chat(message, temperature=temp, top_p=top_p)
+    
+        # Check if the result is a tuple (the RAG case) or a single string
+        if isinstance(chat_result, tuple) and len(chat_result) == 2:
+            reply, context_nodes = chat_result
+        else:
+            # This handles the greeting and clarification cases
+            reply = chat_result
+            context_nodes = [] # Set context_nodes to an empty list
+    
+        # This part of the code remains the same
         ctx_text = "\n\n---\n\n".join([
             f"**Source {i+1} (Score: {node.score:.4f})**\n{node.text}"
             for i, node in enumerate(context_nodes)