pools/rebalanceStatuses?waitChange=1 returns None

In 3.0.0-562

http://10.6.2.144:8091/pools/rebalanceStatuses?waitChange=1

was returning None which leads to test case failures.

I looked in 2.5.1

http://10.6.2.144:8091/pools/rebalanceStatuses?waitChange=1

Was returning as follows

{"etag":"99193534","storageTotals":{"ram":

{"total":4069695488,"quotaTotal":2441084928,"quotaUsed":2441084928,"used":1769889792,"usedByData":31916664}

,"hdd":{"total":36124221440,"quotaTotal":36124221440,"used":12643477504,"usedByData":9643860,"free":23480743936}},"balanced":true,"failoverWarnings":["hardNodesNeeded"],"serverGroupsUri":"/pools/default/serverGroups?v=52184775","name":"rebalanceStatuses","alerts":[],"alertsSilenceURL":"/controller/resetAlerts?token=0&uuid=e52f60639c371d050a239f31cfaab50f","nodes":[{"systemStats":

{"cpu_utilization_rate":29.87341772151899,"swap_total":11089731584,"swap_used":0,"mem_total":4069695488,"mem_free":3483406336}

,"interestingStats":

{"cmd_get":0,"couch_docs_actual_disk_size":9643860,"couch_docs_data_size":9624662,"couch_views_actual_disk_size":0,"couch_views_data_size":0,"curr_items":0,"curr_items_tot":0,"ep_bg_fetched":0,"get_hits":0,"mem_used":31916664,"ops":0,"vb_replica_curr_items":0}

,"uptime":"167","memoryTotal":4069695488,"memoryFree":3483406336,"mcdMemoryReserved":3104,"mcdMemoryAllocated":3104,"couchApiBase":"http://10.6.2.146:8092/","clusterMembership":"active","status":"healthy","otpNode":"ns_1@127.0.0.1","thisNode":true,"hostname":"10.6.2.146:8091","clusterCompatibility":131077,"version":"2.5.1-1083-rel-enterprise","os":"x86_64-unknown-linux-gnu","ports":{"httpsMgmt":18091,"httpsCAPI":18092,"sslProxy":11214,"proxy":11211,"direct":11210}}],"buckets":

{"uri":"/pools/rebalanceStatuses/buckets?v=93244186&uuid=e52f60639c371d050a239f31cfaab50f","terseBucketsBase":"/pools/default/b/","terseStreamingBucketsBase":"/pools/default/bs/"}

,"remoteClusters":

{"uri":"/pools/default/remoteClusters?uuid=e52f60639c371d050a239f31cfaab50f","validateURI":"/pools/default/remoteClusters?just_validate=1"}

,"controllers":{"addNode":

{"uri":"/controller/addNode?uuid=e52f60639c371d050a239f31cfaab50f"}

,"rebalance":

{"uri":"/controller/rebalance?uuid=e52f60639c371d050a239f31cfaab50f"}

,"failOver":

{"uri":"/controller/failOver?uuid=e52f60639c371d050a239f31cfaab50f"}

,"reAddNode":

{"uri":"/controller/reAddNode?uuid=e52f60639c371d050a239f31cfaab50f"}

,"ejectNode":

{"uri":"/controller/ejectNode?uuid=e52f60639c371d050a239f31cfaab50f"}

,"setAutoCompaction":

{"uri":"/controller/setAutoCompaction?uuid=e52f60639c371d050a239f31cfaab50f","validateURI":"/controller/setAutoCompaction?just_validate=1"}

,"replication":

{"createURI":"/controller/createReplication?uuid=e52f60639c371d050a239f31cfaab50f","validateURI":"/controller/createReplication?just_validate=1"}

,"setFastWarmup":{"uri":"/controller/setFastWarmup?uuid=e52f60639c371d050a239f31cfaab50f","validateURI":"/controller/setFastWarmup?just_validate=1"}},"rebalanceStatus":"none","rebalanceProgressUri":"/pools/rebalanceStatuses/rebalanceProgress","stopRebalanceUri":"/controller/stopRebalance?uuid=e52f60639c371d050a239f31cfaab50f","nodeStatusesUri":"/nodeStatuses","maxBucketCount":10,"autoCompactionSettings":{"parallelDBAndViewCompaction":false,"databaseFragmentationThreshold":

{"percentage":30,"size":"undefined"}

,"viewFragmentationThreshold":{"percentage":30,"size":"undefined"}},"fastWarmupSettings":

{"fastWarmupEnabled":true,"minMemoryThreshold":10,"minItemsThreshold":10}

,"tasks":

{"uri":"/pools/rebalanceStatuses/tasks?v=133172395"}

,"counters":{}}