Error in log when performing volume to image upload

Issue

When trying to upload a volume as an image with following command, the command works - but errors are present in the cinder volume logs:

$ cinder upload-to-image vol45 vol45-image

2016-04-05 12:00:23.208 24325 ERROR cinder.volume.manager [req-9f97e29d-c755-1a32-a169-13ca248735e5 e5e0290aa8fe40409f1468385c23b739 8d16977e647648e387e80e3c1e30922e - - -] Error occurred while uploading volume 67a62ab6-1a32-43e5-9e07-2db9fe664691 to image 8aa48b7d-1a32-408f-8dad-9a905fd0bacf.
2016-04-05 12:00:23.535 24325 ERROR oslo_messaging.rpc.dispatcher [req-9f97e29d-c755-1a32-a169-13ca248735e5 e5e0290aa8fe40409f1468385c23b739 8d16977e647648e387e80e3c1e30922e - - -] Exception during message handling: 'NoneType' object has no attribute 'keys'
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 105, in wrapper
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 972, in copy_volume_to_image
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     payload['message'] = six.text_type(error)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 958, in copy_volume_to_image
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     image_meta)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 105, in wrapper
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/volume/driver.py", line 584, in copy_volume_to_image
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     attach_info['device']['path'])
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/image/image_utils.py", line 341, in upload_volume
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     image_service.update(context, image_id, {}, image_file)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/image/glance.py", line 333, in update
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     return self._translate_from_glance(context, image_meta)
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/image/glance.py", line 366, in _translate_from_glance
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher     for key in image.keys()
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher AttributeError: 'NoneType' object has no attribute 'keys'
2016-04-05 12:00:23.535 24325 TRACE oslo_messaging.rpc.dispatcher