Update app.py

app.py

@@ -53,7 +53,7 @@ tokenizer1 = AutoTokenizer.from_pretrained("pedramyazdipoor/persian_xlm_roberta_
 roberta_large = pipeline(task='question-answering', model=model1, tokenizer=tokenizer1)
 
 def Q_A(text=None, audio=None, context=None):
-    if text is None:
+    if text == "":
         question = parse(audio)
     elif audio is None:
         question = text