[Buildbot] #3101: exception while rendering logs

[Buildbot trac]

#3101: exception while rendering logs
-------------------+--------------------
Reporter:  sa2ajj  |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.9.0
 Version:  master  |  Resolution:
Keywords:  web     |
-------------------+--------------------

Comment (by Ben):

 That happened visiting
 http://nine.buildbot.net/#/builders/1/build/24/step/3/log/problems.

 Browser shows:
 {{{GET
 http://nine.buildbot.net/api/v2/logs/1572/contents?limit=16&offset=24 500
 (Internal Server Error)}}}

 Response from server was: {{{{"error": "ValueError('substring not
 found',)"}}}}

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Ticket URL: <http://trac.buildbot.net/ticket/3101#comment:1>
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