[Buildbot] #2978: Loading the waterfall while a build is in progress return 500

[Buildbot trac]

#2978: Loading the waterfall while a build is in progress return 500
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Reporter:  Ben       |       Owner:
    Type:  defect    |      Status:  new
Priority:  critical  |   Milestone:  0.9.0
 Version:  master    |  Resolution:
Keywords:  web       |
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Changes (by dustin):

 * priority:  major => critical


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Ticket URL: <http://trac.buildbot.net/ticket/2978#comment:1>
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