rebalance raises {"unknownNodes":} when invoked on self node on a single node cluster

The rebalance and replication tests are failing with this error :

rebalance api input : rebalanace params : password=password&ejectedNodes=&user=Administrator&knownNodes=ns_1%4010.1.1.152
output :
rebalance:

this happens in a single node cluster where there is only one node.

rebalance should treat this request like a no-op

look for this timestamp in the logs :

[2011-04-25 03:42:09,460]

test logs :
http://qa.hq.northscale.net/job/multiple-nodes-centos-64-extended/19/artifact/test_rebalance_10_percent_ram.log