fix split indexing for single-accent configs

afrispeech-200.py

@@ -188,7 +188,7 @@ class AfriSpeech(datasets.GeneratorBasedBuilder):
                         continue
                     for i in range(ACCENT_STATS[accent][split]['shards']):
                         audio_urls[split].append(_AUDIO_URL.format(accent=accent, split=split, shard_idx=i))
-            else:
+            elif split in ACCENT_STATS[accent]:
                 audio_urls[split] = [
                     _AUDIO_URL.format(accent=accent, split=split, 
                                       shard_idx=i) for i in range(ACCENT_STATS[accent][split]['shards'])
@@ -211,7 +211,7 @@ class AfriSpeech(datasets.GeneratorBasedBuilder):
             "dev": datasets.Split.VALIDATION,
             # "test": datasets.Split.TEST,
         }
-        for split in splits:
+        for split in audio_urls.keys():
             split_generators.append(
                 datasets.SplitGenerator(
                     name=split_names.get(split, split),