mmorey/MDMCoreData — pull request #27 by craigmarvelley (2014-12-16 14:40:10+00:00)
Title: Call completion block if writerObjectContext doesn't have changes to save

Hi,

In the `- (void)saveContextAndWait:(BOOL)wait completion:(void (^)(NSError *error))completion` method of `MDMPersistenceController` it's possible for the `managedObjectContext` to have changes while the `writerObjectContext` does not; in that case the completion block is never called. This PR ensures the completion block is called in that scenario.

Cheers!