mindsnacks/Zinc-ObjC — pull request #39 by amrox (2012-11-03 20:38:35+00:00)
Title: Fix a possible crash if operation is cancelled file adding dependent fil...

...e operations

If the operation is cancelled, then `queueSubtaskForDescriptor` returns nil. Then it would try to add nil to an array, which was causing a crash.

Also added a few more checks for cancelled state.