[Buildbot] #2891: Exception when using Interpolate in description

[Buildbot trac]

#2891: Exception when using Interpolate in description
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Reporter:  sa2ajj  |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.9.+
 Version:  0.8.9   |  Resolution:
Keywords:          |
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Comment (by dustin):

 That pull req was invalid: description, descriptionDone, and
 descriptionSuffix can be lists or strings.

 So I think the bug is that !ShellCommand.describe is not returning a list.
 This is all getting rewritten as part of #2818, so the remaining fix here
 is eight-only.  And the workaround is just to add [..] to the description
 parameter.

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Ticket URL: <http://trac.buildbot.net/ticket/2891#comment:5>
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