[Buildbot] #3617: dataModule: do not call callbacks if close() was called

[Buildbot trac]

#3617: dataModule: do not call callbacks if close() was called
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Reporter:  tardyp     |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.12     |   Keywords:
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 in the case of use click quickly from page to page, there can be some
 corruption of the breadcrumb.

 This could be circumvented generically by preventing callback to be called
 if the calling scope has been destroyed.

 so data.close() should at best cancel any pending request, and at worst
 stop propagation of events when the request finally succeed.

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Ticket URL: <http://trac.buildbot.net/ticket/3617>
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