Fix pred_avg_pitch_emb

TTS/tts/models/vits.py

@@ -1727,7 +1727,8 @@ class Vits(BaseTTS):
 
         attn_mask = x_mask * y_mask.transpose(1, 2)  # [B, 1, T_enc] * [B, T_dec, 1]
         attn = generate_path(w_ceil.squeeze(1), attn_mask.squeeze(1).transpose(1, 2))
-
+        
+        pred_avg_pitch_emb = None
         if self.args.use_pitch:
             _, _, pred_avg_pitch_emb = self.forward_pitch_predictor(x, x_lengths, g_pp=g, pitch_transform=pitch_transform)
             x = x + pred_avg_pitch_emb