Update app.py

app.py

@@ -280,18 +280,19 @@ with gr.Blocks(css="""#chatbot { font-size: 14px; min-height: 1200; }""") as dem
             )
 
     def respond(message, chat_history, url_value, file_value, key_value, model_value):
+        if message.strip() == "":
+            return "", chat_history  # Return empty message if no input
+        
         try:
             if key_value.strip() == '':
-                return chat_history + [
-                    {"role": "user", "content": message},
-                    {"role": "assistant", "content": '[ERROR]: Please enter your OpenAI API key'}
-                ]
+                chat_history.append({"role": "user", "content": message})
+                chat_history.append({"role": "assistant", "content": '[ERROR]: Please enter your OpenAI API key'})
+                return "", chat_history
             
             if url_value.strip() == '' and file_value is None:
-                return chat_history + [
-                    {"role": "user", "content": message},
-                    {"role": "assistant", "content": '[ERROR]: Both URL and PDF are empty. Provide at least one'}
-                ]
+                chat_history.append({"role": "user", "content": message})
+                chat_history.append({"role": "assistant", "content": '[ERROR]: Both URL and PDF are empty. Provide at least one'})
+                return "", chat_history
 
             # Process PDF and generate answer
             if url_value.strip() != '':
@@ -305,16 +306,15 @@ with gr.Blocks(css="""#chatbot { font-size: 14px; min-height: 1200; }""") as dem
 
             answer = generate_answer(message, key_value, model_value)
             
-            return chat_history + [
-                {"role": "user", "content": message},
-                {"role": "assistant", "content": answer}
-            ]
+            chat_history.append({"role": "user", "content": message})
+            chat_history.append({"role": "assistant", "content": answer})
+            
+            return "", chat_history
 
         except Exception as e:
-            return chat_history + [
-                {"role": "user", "content": message},
-                {"role": "assistant", "content": f'[ERROR]: {str(e)}'}
-            ]
+            chat_history.append({"role": "user", "content": message})
+            chat_history.append({"role": "assistant", "content": f'[ERROR]: {str(e)}'})
+            return "", chat_history
 
     submit_btn.click(
         respond, 
@@ -328,4 +328,6 @@ with gr.Blocks(css="""#chatbot { font-size: 14px; min-height: 1200; }""") as dem
         [msg, chatbot]
     )
 
-demo.launch()
+demo.launch()
+
+