Update app.py

app.py

@@ -8,10 +8,10 @@ lock = threading.Lock()
 LLM = "gpt-4o"
 
 def invoke(openai_api_key, task):
-    if (openai_api_key == ""):
+    if not openai_api_key:
         raise gr.Error("OpenAI API Key is required.")
 
-    if (task == ""):
+    if not task:
         raise gr.Error("Task is required.")
     
     with lock: