twilio/BankersBox — pull request #4 by guillaumepotier (2013-02-25 21:23:14+00:00)
Title: Fixed undefined values on sets when using BankersBoxNullAdapter

Hi,

I found two errors while using sets data (`sadd`, `srem`..) and the `BankersBoxNullAdapter`.

Here is a small PR that only checks if value is not undefined.