Update app.py

app.py

@@ -63,8 +63,8 @@ def chat_with_gemini(user_input, history):
 
 def process_audio(audio, history):
     """Process audio input, convert to text, and get response."""
-    if audio is None:
-        return "No audio detected", history, None
+    if not audio:  # This checks for both None and empty input
+        return None, history, None
     
     # Convert audio to text
     user_input = transcribe_audio(audio)