[Buildbot] #3567: buildbot nine master trigger traceback in old 'slave'

[Buildbot trac]

#3567: buildbot nine master trigger traceback in old 'slave'
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Reporter:  tardyp       |       Owner:  tardyp
    Type:  enhancement  |      Status:  assigned
Priority:  major        |   Milestone:  0.9.0
 Version:  master       |  Resolution:
Keywords:               |
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Comment (by tardyp):

 https://github.com/buildbot/buildbot/pull/2287

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Ticket URL: <http://trac.buildbot.net/ticket/3567#comment:5>
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