Occasionally a crash occurs when reloading a table node

[Kofktu]

// If you're looking for help, please consider joining our slack channel:
// http://asyncdisplaykit.org/slack (we'll be updating the name to Texture soon)

// The more information you include, the faster we can help you out!
// Please include: a sample project or screenshots, code snippets
// Texture version, and/or backtraces for any crashes (> bt all).
// Please delete these lines before posting. Thanks!

Intermittent crash occurs during reload after API communication.
Check the crash log.
ASDataController.updateWithChangeSet:
SIGKILL keeps waiting indefinitely due to dispatch_group_wait.

How can you fix it?

[Kofktu]

PR #1251