kaazing/robot — pull request #56 by jfallows (2014-10-20 18:17:55+00:00)
Title: Candidate fix for issue #55 NPE in LocationInfo at end of test.

Appears that a null LocationInfo is making it into the ArrayList of LocationInfos, despite a null check guard.
Expect this is caused by a multi-threaded race between client worker and server worker during test teardown.
Updated relevant data structures to their concurrent equivalents.