Update vc_infer_pipeline.py

vc_infer_pipeline.py

@@ -420,6 +420,9 @@ class VC(object):
                 )[0]
             audio_opt.append(audio_piece[self.t_pad_tgt : -self.t_pad_tgt])
 
+        if not audio_opt:
+        raise ValueError("No audio segments were generated")
+        
         audio_opt = np.concatenate(audio_opt)
         if rms_mix_rate != 1:
             audio_opt = change_rms(audio, 16000, audio_opt, tgt_sr, rms_mix_rate)