fixed class 'set' so that if None is an element, it is treated properly. #770

merged 2 commits into from Aug 2, 2012
Commits on Aug 2, 2012
  1. @earney
  2. @earney

    modified sets, so that None is handled properly, modified

    earney committed Aug 2, 2012 so that all unit tests are executed (removed return statements).