nodes returning empty vBucketMap

Our automation creates a bucket and then waits to read the vbucket map, but is timing out as the array is never populated in the return data:

curl -s http://10.1.2.126:8091/pools/default/buckets/default | json_xs

gives =>

"vBucketServerMap" :

{ "vBucketMap" : [], "numReplicas" : 1, "hashAlgorithm" : "CRC", "serverList" : [ "10.1.2.125:11210" ] }

Which is causing our tests to fail =>

2012-02-14 14:41:07,792 - root - INFO - creating direct client 10.1.2.126:11210 default
2012-02-14 14:42:08,095 - root - INFO - vbucket map is not ready for bucket default after waiting 60 seconds
2012-02-14 14:43:08,294 - root - INFO - vbucket map is not ready for bucket default after waiting 60 seconds
2012-02-14 14:43:08,312 - root - INFO - creating direct client 10.1.2.126:11210 default
2012-02-14 14:44:08,524 - root - INFO - vbucket map is not ready for bucket default after waiting 60 seconds
...
MemcachedError: Memcached error #7: I'm not responsible for this vbucket