[Buildbot] #3071: /builds/:id/changes returns error

[Buildbot trac]

#3071: /builds/:id/changes returns error
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Reporter:  Ben     |       Owner:
    Type:  defect  |      Status:  new
Priority:  major   |   Milestone:  0.9.0
 Version:  master  |  Resolution:
Keywords:  data    |
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Comment (by dustin):

 The first step to fixing this will be to produce a failing test case.

 Even if the underlying model issue that Ben has identified isn't fixed,
 the endpoint should return a more sensible error in the failing cases.

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Ticket URL: <http://trac.buildbot.net/ticket/3071#comment:16>
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