Diff exception

[dread]

Exception raised doing this particular diff.

​http://ckan.net/revision/diff/sudocfr?diff_entity=package&oldid=a18b2520-09e0-44be-80dd-4fea94ffe7d1&diff=3934ff16-a3a7-4481-b390-72944903b945

...
Module ckan.controllers.revision:142 in diff
<<          if c.diff_entity == 'package':
                   c.pkg = model.Package.by_name(id)
                   diff = c.pkg.diff(c.revision_to, c.revision_from)
               elif c.diff_entity == 'group':
                   c.group = model.Group.by_name(id)
>>  diff = c.pkg.diff(c.revision_to, c.revision_from)
Module ckan.model.package:449 in diff
<<                              display_id = to_obj_rev.tag.name
                               elif obj_class.__name__ == 'PackageExtra':
                                   display_id = to_obj_rev.key
                               else:
                                   display_id = related_obj_id[:4]
>>  display_id = to_obj_rev.key
AttributeError: 'NoneType' object has no attribute 'key'

Seems to be to do with this particular extra key:

[<PackageExtraRevision id=ba1f3b3e-f61f-4924-bae0-ec3dd2163ae4 package_id=febe4da9-5874-4411-a7da-b497fdebf739 key=namespace value=http://www.sudoc.fr/ state=active revision_id=5ec8e730-c73d-4f1c-989b-2e015eb3d315 continuity_id=ba1f3b3e-f61f-4924-bae0-ec3dd2163ae4 expired_id=None revision_timestamp=2011-07-08 13:48:11.027260 expired_timestamp=9999-12-31 00:00:00 current=True>]

Is it because it was created between the from_revision and to_revision?

[dread]

I haven't seen this for a while - could have been due to database corruption which has been fixed.