add exception

app.py

@@ -25,8 +25,10 @@ def generate_example_prompt():
 with gr.Blocks(title = "LLM Code injection", ) as demo:
     if not os.environ.get("OPENAI_API_KEY"):
         api_key_input = gr.Textbox(lines = 1, label = "OpenAI API Key", placeholder = "Enter your OpenAI API key", autofocus=True)
-        if api_key_input.value:
+        try:
             os.environ["OPENAI_API_KEY"] = api_key_input.value
+        except ValueError:
+            Exception("Invalid API key")
     
     # Add a noninteractive image
     #gr.Image(image_path, interactive=False, label="Demonstration Image")