[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 sa2ajj):

 (Sorry, the code link above was incorrect for master.)

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Ticket URL: <http://trac.buildbot.net/ticket/2891#comment:4>
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