Adding ops_nfsw causes errors with category not found

[davegreen]

Adding ops_nfsw to the configuration appears to cause errors. The logs mention running weka stats list-types to check it's in the output, which it is.

export-config.yaml

config:
  stats:
    ops_nfsw: # Category
      OPS: ops

running weka stats list-types provides this statistic in the output:

CATEGORY	CATEGORY LABEL	IDENTIFIER	DESCRIPTION	LABEL	TYPE	UNIT	PARAMETERS	RELATED RATE	PARAMETER	PERMISSION	FOR NODE TYPE	CAN ACCUMULATE	HISTOGRAM	HISTOGRAM UNIT
ops_nfsw	Operations (NFSw)	OPS	Total number of operations	OPS (total)	Rate	Ops/Sec	nFSVersions	USER	MANAGEMENT	True		False