[Buildbot] #3533: API request handling failure

[Buildbot trac]

#3533: API request handling failure
----------------------+-----------------------
Reporter:  cmouse     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  master     |   Keywords:
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 I get this in logs occasionally when browsing the Web UI.

 2016-04-22 11:25:42+0300 [-] while handling API request
         Traceback (most recent call last):
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/twisted/internet/defer.py", line 1126, in _inlineCallbacks
             result = result.throwExceptionIntoGenerator(g)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/twisted/python/failure.py", line 389, in
 throwExceptionIntoGenerator
             return g.throw(self.type, self.value, self.tb)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/buildbot/www/rest.py", line 407, in renderRest
             request.write(data)
           File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
             self.gen.throw(type, value, traceback)
         --- <exception caught here> ---
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/buildbot/www/rest.py", line 124, in handleErrors
             yield
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/buildbot/www/rest.py", line 339, in renderRest
             data = yield ep.get(rspec, kwargs)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/twisted/internet/defer.py", line 1126, in _inlineCallbacks
             result = result.throwExceptionIntoGenerator(g)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/twisted/python/failure.py", line 389, in
 throwExceptionIntoGenerator
             return g.throw(self.type, self.value, self.tb)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/buildbot/data/changes.py", line 73, in get
             changes = yield
 self.master.db.changes.getChangesForBuild(buildid)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
             result = g.send(result)
           File "/opt/buildbot/local/lib/python2.7/site-
 packages/buildbot/db/changes.py", line 196, in getChangesForBuild
             if change and change['changeid'] != toChanges.get(cb,
 {}).get('changeid'):
         exceptions.AttributeError: 'NoneType' object has no attribute
 'get'

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Ticket URL: <http://trac.buildbot.net/ticket/3533>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation