removed extra returned value that blows up the pipeline in case the i…

…nferred audio segment is empty (all zeros)

rvc/lib/predictors/FCPE.py

@@ -904,9 +904,7 @@ def compute_f0(self, wav, p_len=None):
         p_len = x.shape[0] // self.hop_length if p_len is None else p_len
         f0 = self.fcpe(x, sr=self.sample_rate, threshold=self.threshold)[0, :, 0]
         if torch.all(f0 == 0):
-            return f0.cpu().numpy() if p_len is None else np.zeros(p_len), (
-                f0.cpu().numpy() if p_len is None else np.zeros(p_len)
-            )
+            return f0.cpu().numpy() if p_len is None else np.zeros(p_len)
         return self.post_process(x, self.sample_rate, f0, p_len)[0]
 
     def compute_f0_uv(self, wav, p_len=None):