[Buildbot] #3115: Cannot display slave status

[Buildbot trac]

#3115: Cannot display slave status
----------------------+-----------------------
Reporter:  kayhayen   |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.10     |   Keywords:
----------------------+-----------------------
 I upgraded von 0.8.9 to 0.8.10 and now have this for every slave status
 display:

 web.Server Traceback (most recent call last):
 exceptions.TypeError: 'NoneType' object has no attribute '__getitem__'
 /opt/buildbot/sandbox/lib/python2.7/site-
 packages/twisted/internet/defer.py:139 in maybeDeferred
 138    try:
 139        result = f(*args, **kw)
 140    except:
 /opt/buildbot/sandbox/lib/python2.7/site-
 packages/buildbot/status/web/base.py:391 in <lambda>
 390            if allowed or path_always_viewable(request):
 391                return defer.maybeDeferred(lambda:
 self.content(request, ctx))
 392            else:
 /opt/buildbot/sandbox/lib/python2.7/site-
 packages/buildbot/status/web/slaves.py:117 in content
 116        try:
 117            max_builds = int(request.args.get('numbuilds')[0])
 118        except ValueError:
 exceptions.TypeError: 'NoneType' object has no attribute '__getitem__'


 This happened for buildbots not even running. I did do upgrade-master once
 I noticed, so that ought to be not an issue. I also deleted all historical
 builds. Will it help to drop the sqlite database?

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Ticket URL: <http://trac.buildbot.net/ticket/3115>
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