Missing meta.json in 4.5.1 build after running cbbackup

In backup directory structure tests on build 4.5.1-2840, tests failed due to no meta.json file in backup folder
ls /tmp/backup/2016-09-13T195729Z/2016-09-13T195740Z-accu/bucket-bucket0/node-172.23.109.19%3A8091/
data-0000.cbb failover.json seqno.json snapshot_markers.json

Run test in 4.5.0, tests passed.
ls /tmp/backup/2016-09-13T201540Z/2016-09-13T202009Z-accu/bucket-bucket0/node-172.23.109.19%3A8091/
data-0000.cbb failover.json meta.json seqno.json snapshot_markers.json

Here is one of tests:
backup.ibr.IBRTests.testMultipleIncrBackupDirStructure,standard_buckets=1,sasl_buckets=1,items=1000,replicas=0,item_flag=232216,max_verify=1000,skip_cleanup=False