Update voice_processing.py

voice_processing.py

@@ -224,6 +224,9 @@ async def tts(
             None,
         )
 
+        if audio_opt is None or len(audio_opt) == 0:
+            raise ValueError("No audio was generated")
+
         if tgt_sr != resample_sr and resample_sr >= 16000:
             tgt_sr = resample_sr
         
@@ -241,7 +244,7 @@ async def tts(
         return info, None, None
     except Exception as e:
         logger.exception("Error in TTS processing")
-        return str(e), None, None
+        return str(e), None, (None, None)  # Return a tuple with None values instead of None
 
 voice_mapping = {
     "Mongolian Male": "mn-MN-BataaNeural",