Update app.py

app.py

@@ -9,8 +9,8 @@ tagen = "https://huggingface.co/wietsedv/tacotron2-gronings/resolve/main/tts_ljs
 vocoder_tagen = "parallel_wavegan/ljspeech_parallel_wavegan.v3" 
 
 text2speechen = Text2Speech.from_pretrained(
-    model_tag=str_or_none(tagen),
-    vocoder_tag=str_or_none(vocoder_tagen),
+    model_tag=tagen,
+    vocoder_tag=vocoder_tagen,
     device="cpu",
     threshold=0.5,
     minlenratio=0.0,