Update app.py

app.py

@@ -14,6 +14,10 @@ def speech_to_text(mic=None, file=None, lang=None):
         audio = file
     else:
         raise gr.Error("You must either provide a mic recording or a file")
+
+    if lang is None or lang == '':
+        lang = None
+
     task = 'transcribe' if lang is None else 'translate'
     print(lang, task)