[Buildbot] #3559: poller change_hook is broken

[Buildbot trac]

#3559: poller change_hook is broken
---------------------+-------------------
Reporter:  gracinet  |      Owner:
    Type:  defect    |     Status:  new
Priority:  minor     |  Milestone:  0.9.0
 Version:  0.9.0b9   |   Keywords:
---------------------+-------------------
 There's some API change in the www component that makes this change_hook
 unusable:

 {{{
 2016-06-07 17:00:23+0200 [_GenericHTTPChannelProtocol,0,127.0.0.1]
 processing changes from web hook
         Traceback (most recent call last):
         Failure: exceptions.AttributeError: RotateLogSite instance has no
 attribute 'master'

 }}}

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Ticket URL: <http://trac.buildbot.net/ticket/3559>
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