Update app.py

app.py

@@ -31,7 +31,6 @@ if genai is not None:
             logging.info(f"Gemini model initialized: {MODEL_NAME}")
         except Exception as e:
             logging.error(f"Failed to initialize Gemini model '{MODEL_NAME}': {e}")
-            model = None
 else:
     logging.error("google.generativeai is not available.")
 
@@ -47,6 +46,7 @@ async def _call_gemini_generate(prompt: str):
 async def on_chat_start():
     """Welcome message and session init."""
     cl.user_session.set("message_history", [{"role": "system", "content": SYSTEM_PROMPT}])
+    
     if model is None:
         await cl.Message(
             content=(
@@ -97,4 +97,7 @@ async def handle_message(message: cl.Message):
 
     # Save assistant reply to history
     history.append({"role": "assistant", "content": reply})
-    cl.user_session.set("message_history", history)
+    cl.user_session.set("message_history", history)
+
+if __name__ == "__main__":
+    logging.info("Starting the application...")