[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:  major   |   Milestone:  0.9.0
 Version:  0.8.9   |  Resolution:
Keywords:          |
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Changes (by Ben):

 * owner:   => dustin
 * status:  new => assigned


Comment:

 The point is, after that `finally`, in case unhandled is not empty, the
 result of the step switch to purple (EXCEPTION). All my steps that have no
 stdout (only stderr, still trying to configure my slave ...), have a
 purple status, and are probably the ones that spit out those errors. As
 soon as the step is generating some stdout, the status is red (ERROR), as
 expected.

 All in all, the error is probably that `addStdout` is not being called
 once.

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Ticket URL: <http://trac.buildbot.net/ticket/2951#comment:3>
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