Update app.py

app.py

@@ -59,7 +59,7 @@ st.title("Gemini API Chatbot")
 chat_history = st.session_state.get("chat_history", [])
 
 # Convert chat history to the expected format
-chat_history = [{"role": message["role"], "parts": [{"text": message["content"]}]} for message in chat_history]
+chat_history = [{"role": message["role"], "parts": [{"text": message.get("content", "")}]} for message in chat_history]
 
 # Display previous messages
 for message in chat_history: