Update app.py

app.py

@@ -50,7 +50,7 @@ def predict(_chatbot, task_history, user_input):
     print("Type of task_history:", type(task_history))
     if task_history is None or not isinstance(task_history, list):
         task_history = [] 
-    else 
+    else :
         task_history = parse_task_history(task_history)
 
     print("Predict - Start: task_history =", task_history)