Fix NPE when Network Tree window closing overlaps with event #234
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Very, very rarely I was encountering an NPE when closing the Network Tree (Configure Nodes) window.
The cause was a PropertyChangeEvent arriving after the
release()call had (in theory) closed everything down. That nulled-out thetimerreference. This detects that condition and ignores the event with a warning in the log.Not clear to me whether that log message should be a warning or some lower level, though.