[Bug 1292102] Fix proposed to neutron (stable/icehouse)

[OpenStack Infra]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/111263

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https://bugs.launchpad.net/bugs/1292102

Title:
  AttributeError: 'NoneType' object has no attribute 'obj'
  (driver.obj.release_segment(session, segment))

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