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

[Buildbot trac]

#3071: /builds/:id/changes returns error
-------------------+-------------------
Reporter:  Ben     |      Owner:
    Type:  defect  |     Status:  new
Priority:  major   |  Milestone:  0.9.0
 Version:  master  |   Keywords:  data
-------------------+-------------------
 Nothing in twisted log, but when visiting the URL in a browser, I get
 this:

 {{{
 {"error": "TypeError(\"'NoneType' object has no attribute
 '__getitem__'\",)"}
 }}}

 I don;t know where to look at ... __getitem__ is pretty generic

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