Update NST.py

NST.py

@@ -258,6 +258,9 @@ class Nst(datasets.GeneratorBasedBuilder):
                             fields = {key: metadata[metadata_key][_METADATA_MAPPING[key]] for key in data_fields}
                             fields["channels"] = 1
                             fields["file"] = fields["file"].replace(".wav", ".mp3")
+                            # Fixing some errors in the metadata
+                            if fields["age"] == "slethei":
+                                fields["age"] = 0
                             yield metadata_key, {
                                 "id": metadata_key,
                                 "audio": audio_dict,