Simperium/simperium-ios — pull request #326 by jleandroperez (2014-08-05 19:32:51+00:00)
Title: SPBucket: Prevents empty lastChangeSignature scenarios

There are several flows that could, potentially, lead to multiple calls to `SPWebSocketChannel :: allVersionsFinishedForBucket` method.

If that happens, we could, potentially, end up with a SPBucket instance with a nil `lastChangeSignature field.

Fixes #325