Fix bugs in the non-multilingual VITS inference

TTS/tts/models/vits.py

@@ -448,7 +448,8 @@ class Vits(BaseTTS):
             g = self.emb_g(sid).unsqueeze(-1)  # [b, h, 1]
 
         # language embedding
-        if self.args.use_language_embedding:
+        lang_emb=None
+        if self.args.use_language_embedding and lid is not None:
             lang_emb = self.emb_l(lid).unsqueeze(-1)
 
         x, m_p, logs_p, x_mask = self.text_encoder(x, x_lengths, lang_emb=lang_emb)
@@ -530,6 +531,7 @@ class Vits(BaseTTS):
             g = self.emb_g(sid).unsqueeze(-1)
 
         # language embedding
+        lang_emb=None
         if self.args.use_language_embedding and lid is not None:
             lang_emb = self.emb_l(lid).unsqueeze(-1)