[Buildbot] #2951: AttributeError: 'NoneType' object has no attribute 'append'

[Buildbot trac]

#2951: AttributeError: 'NoneType' object has no attribute 'append'
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Reporter:  Ben       |       Owner:  dustin
    Type:  defect    |      Status:  assigned
Priority:  critical  |   Milestone:  0.9.0
 Version:  master    |  Resolution:
Keywords:            |
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Changes (by Ben):

 * priority:  major => critical
 * version:  0.8.9 => master


Comment:

 Raising the priority as this is in the moment the issue preventing me from
 showcasing buildbot around there (unexplainable build status).

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Ticket URL: <http://trac.buildbot.net/ticket/2951#comment:4>
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