[Buildbot] #3600: Error while handling API request

[Buildbot trac]

#3600: Error while handling API request
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Reporter:  cmouse   |       Owner:
    Type:  defect   |      Status:  new
Priority:  minor    |   Milestone:  undecided
 Version:  0.9.0b9  |  Resolution:
Keywords:           |
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Comment (by tardyp):

 related bug:

 http://trac.buildbot.net/ticket/3461

 looks like toChanges might be None in this case or toChanges[cb] is None

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Ticket URL: <http://trac.buildbot.net/ticket/3600#comment:1>
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