Update one property erase others

I use Glance (bzr116) on ubuntu 10.04 LTS.

if I update a property of an image, the older properties (set before) are erased.

Example:

$ glance show 71
URI: http://0.0.0.0/images/71
Id: 71
Public: No
Name: Ubuntu_64.71
Size: 0
Location: None
Disk format: ami
Container format: ami
Property 'image_location': snapshot
Property 'image_state': available
Property 'kernel_id': 59
Property 'ramdisk_id': None
Property 'architecture': x86_64
Property 'owner_id': simple

$ glance update 71 is_public=true

$ glance show 71
URI: http://0.0.0.0/images/71
Id: 71
Public: Yes
Name: Ubuntu_64.71
Size: 10737418240
Location: file:///media/nas/OpenStack/Glance/71
Disk format: ami
Container format: ami

Another sample :

$ glance show 60
URI: http://0.0.0.0/images/60
Id: 60
Public: Yes
Name: Ubuntu_64
Size: 3221225472
Location: file:///media/nas/OpenStack/Glance/60
Disk format: ami
Container format: ami
Property 'architecture': x86_64

$ glance upload 60 kernel_id=59

$ glance show 60
URI: http://0.0.0.0/images/60
Id: 60
Public: Yes
Name: Ubuntu_64
Size: 3221225472
Location: file:///media/nas/OpenStack/Glance/60
Disk format: ami
Container format: ami
Property 'kernel_id': 59