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Description of problem:
In a failover domain if you set the checkbox "No Failback" and no other checkboxes and then hit "Update Properties" you get a traceback:

AttributeError: FailoverDomain instance has no attribute 'clear_member_nodeis'

Looks like this happens if you set "Prioritized" hit "Update Properties" and the try to unset "Prioritized" and hit "Update Priorities".

Looks like a mis-spelled variable causes this traceback.  Fixed in 3614120e4b3d0b326404ce141a84a1223312e6f4

tested a bunch of combinations with No Failback , Prioritized on/off and it seems to working just fine.

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.