More comments

opusparcus.py

@@ -138,7 +138,7 @@ class Opusparcus(datasets.GeneratorBasedBuilder):
         # separated by a period, containing the values of
         # self.config.lang and self.config.quality.
 
-        if lang is None:
+        if self.config.lang is None:
             # This is an error, nothing to do here
             return []