chobj clear on a bucket doesn't work

[derek@walrus:~ ] $ chobj -m clear test_umobj:
Traceback (most recent call last):
  File "/usr/bin/chobj", line 169, in <module>
    acl.add_user_grant('FULL_CONTROL', object.owner.id)
<type 'type'>: 'Bucket' object has no attribute 'owner'

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