Extract dataset and model for fairseq models

When we use the model "tts_models/eng/fairseq/vits", got the following error.

Error in text to speech: cannot access local variable 'dataset' where it is not associated with a value

at line ..../.conda/envs/venv/lib/python3.11/site-packages/TTS/utils/manage.py", line 304, in _set_model_item
    model_full_name = f"{model_type}--{lang}--{dataset}--{model}"

TTS/utils/manage.py

@@ -262,6 +262,8 @@ def _set_model_item(self, model_name):
         if "fairseq" in model_name:
             model_type = "tts_models"
             lang = model_name.split("/")[1]
+            dataset = model_name.split("/")[2]
+            model = model_name.split("/")[3]
             model_item = {
                 "model_type": "tts_models",
                 "license": "CC BY-NC 4.0",