[Buildbot] #3546: MasterShellCommand ends up in exception

[Buildbot trac]

#3546: MasterShellCommand ends up in exception
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Reporter:  gracinet  |       Owner:
    Type:  defect    |      Status:  new
Priority:  major     |   Milestone:  undecided
 Version:  master    |  Resolution:
Keywords:            |
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Comment (by tardyp):

 https://github.com/buildbot/buildbot/pull/2203

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Ticket URL: <http://trac.buildbot.net/ticket/3546#comment:2>
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