Raise an error when there is no model input at qa creation

app.py

@@ -99,6 +99,10 @@ def run_qa(use_existed_corpus: bool, corpus_df: pd.DataFrame, corpus_file: str,
 	if os.getenv("OPENAI_API_KEY") is None:
 		gr.Error("Please submit your OpenAI API key first.")
 		return "Please submit your OpenAI API key first.", original_qa_df
+	if model_name is None:
+		gr.Error("Please select a model first.")
+		return "Please select a model first.", original_qa_df
+
 	llm = OpenAI(model=model_name)
 
 	if qa_method == "default":
@@ -231,6 +235,6 @@ with gr.Blocks(theme="earneleh/paris") as demo:
 	upstage_key_textbox.submit(on_submit_upstage_key, inputs=[upstage_key_textbox], outputs=upstage_key_status_box)
 
 
-# if __name__ == "__main__":
-# 	demo.launch(share=False, debug=True)
-demo.launch(share=False, debug=False)
+if __name__ == "__main__":
+	demo.launch(share=False, debug=True)
+# demo.launch(share=False, debug=False)