fix absent split meta

afrispeech-200.py

@@ -201,7 +201,8 @@ class AfriSpeech(datasets.GeneratorBasedBuilder):
         if accent == 'all':
             meta_urls = {split: _TRANSCRIPT_URL_ALL.format(split=split) for split in splits}
         else:
-            meta_urls = {split: _TRANSCRIPT_URL.format(accent=accent, split=split) for split in splits}
+            meta_urls = {split: _TRANSCRIPT_URL.format(accent=accent, split=split) 
+                         for split in splits if split in ACCENT_STATS[accent]}
         
         meta_paths = dl_manager.download_and_extract(meta_urls)