[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:  tardyp
    Type:  defect    |      Status:  assigned
Priority:  critical  |   Milestone:  0.9.0
 Version:  master    |  Resolution:
Keywords:            |
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Changes (by tardyp):

 * owner:  dustin => tardyp


Comment:

 I can look at it. Do you confirm that the simplest way of reproducing is
 just a step that does not output

 ShellCommand("sleep 1")

 is currently finishing as exception, right?

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Ticket URL: <http://trac.buildbot.net/ticket/2951#comment:5>
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