SwiftSignal "TypeError: 'NoneType' object is not iterable"

[Jason Dunsmore]

SwiftSignal occasionally fails with:

2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource Traceback (most recent call last):
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/resource.py", line 625, in _action_recorder
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource yield
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/resource.py", line 696, in _do_action
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource yield self.action_handler_task(action, args=handler_args)
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/scheduler.py", line 320, in wrapper
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource step = next(subtask)
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/resource.py", line 670, in action_handler_task
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource while not check(handler_data):
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/resources/openstack/heat/swiftsignal.py", line 315, in check_create_complete
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource statuses = self.get_status()
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource File "/opt/heat/lib/python2.7/site-packages/heat/engine/resources/openstack/heat/swiftsignal.py", line 295, in get_status
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource return [s[self.STATUS] for s in self.get_signals()]
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource TypeError: 'NoneType' object is not iterable
2015-09-08 09:51:32.886 22851 ERROR heat.engine.resource

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/221511

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/221511
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=ac5f0ac8b4fa64364e91bc5215ed9f7f1e286aa9
Submitter: Jenkins
Branch: master

commit ac5f0ac8b4fa64364e91bc5215ed9f7f1e286aa9
Author: Jason Dunsmore <email address hidden>
Date: Tue Sep 8 15:47:34 2015 -0500

    Retry if Swift objects are not available yet

    Swift objects may not be immediately available after creation due to
    Swift consistency issues. Check if the objects are being returned and
    retry if not.

    Change-Id: I499389940a06965d213fcec458dfa388af47231e
    Closes-Bug: #1493522