[Buildbot] #2951: AttributeError: 'NoneType' object has no attribute 'append'

[Buildbot trac]

#2951: AttributeError: 'NoneType' object has no attribute 'append'
---------------------+-----------------------
Reporter:  Ben       |       Owner:  tardyp
    Type:  defect    |      Status:  assigned
Priority:  critical  |   Milestone:  0.9.0
 Version:  master    |  Resolution:
Keywords:            |
---------------------+-----------------------

Comment (by Pierre Tardy <pierre.tardy@…>):

 In [changeset:"4721f5468705e2f303215c12fd46adf8a4b54240"]:
 {{{
 #!CommitTicketReference repository=""
 revision="4721f5468705e2f303215c12fd46adf8a4b54240"
 integration test for trac #2951

 add a test for the case which the db is too slow to complete the newLog
 before end of the step

 if I revert previous commit, I get the error reported by benallard

 ===============================================================================
 [ERROR]
 Traceback (most recent call last):
   File "/Users/ptardy/dev/bb/buildbot-
 heroku/buildbot/master/buildbot/process/buildstep.py", line 157, in next
     self._catchup()
   File "/Users/ptardy/dev/bb/buildbot-
 heroku/buildbot/master/buildbot/process/buildstep.py", line 159, in
 _catchup
     self.step._start_unhandled_deferreds.append(d)
 exceptions.AttributeError: 'NoneType' object has no attribute 'append'

 buildbot.test.integration.test_custom_buildstep.RunSteps.test_OldStyleCustomBuildStepSlowDB
 buildbot.test.integration.test_custom_buildstep.RunSteps.test_OldStyleCustomBuildStepSlowDB
 ===============================================================================
 [ERROR]
 Traceback (most recent call last):
   File "/Users/ptardy/dev/bb/buildbot-
 heroku/buildbot/master/buildbot/process/buildstep.py", line 135, in
 gotAsync
     self._catchup()
   File "/Users/ptardy/dev/bb/buildbot-
 heroku/buildbot/master/buildbot/process/buildstep.py", line 159, in
 _catchup
     self.step._start_unhandled_deferreds.append(d)
 exceptions.AttributeError: 'NoneType' object has no attribute 'append'

 buildbot.test.integration.test_custom_buildstep.RunSteps.test_OldStyleCustomBuildStepSlowDB

 Signed-off-by: Pierre Tardy <pierre.tardy at intel.com>
 }}}

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Ticket URL: <http://trac.buildbot.net/ticket/2951#comment:8>
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