AFNetworking/AFNetworking — pull request #922 by Logicopolis (2013-04-13 02:34:26+00:00)
Title: Update to prevent crash

Check if JSONData actually exists so that a nil is not passed into [NSJSONSerialization JSONObjectWithData:options:error:]

If JSONData is nil it may be due to a networking error that was already setup to be handled/reported.