[Buildbot] #3255: Build page not showing properties when build contains a trigger step

[Buildbot trac]

#3255: Build page not showing properties when build contains a trigger step
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Reporter:  riziero  |       Owner:
    Type:  defect   |      Status:  new
Priority:  major    |   Milestone:  0.9.0
 Version:  master   |  Resolution:
Keywords:           |
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Comment (by tardyp):

 It is a problem of event management. We should propagate event when
 properties have changed.

 Should send the event here:
 https://github.com/buildbot/buildbot/blob/master/master/buildbot/data/properties.py#L52

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Ticket URL: <http://trac.buildbot.net/ticket/3255#comment:9>
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