[notodiff] Don't use so many list comprehensions
[notodiff] Don't use so many list comprehensions

Should be a no-op change; finally taking action on
https://github.com/googlei18n/nototools/pull/163#issuecomment-178728256.

dougfelt/nototools,moyogo/nototools,googlei18n/nototools,googlefonts/nototools,anthrotype/nototools,moyogo/nototools,googlei18n/nototools,googlefonts/nototools,anthrotype/nototools,googlefonts/nototools,dougfelt/nototools,moyogo/nototools,googlei18n/nototools,googlefonts/nototools,dougfelt/nototools,googlefonts/nototools,anthrotype/nototools