can't parse single-value data with no dimensions

[aportagain]

In [24]: import xarray
In [25]: dset = xarray.Dataset()
In [26]: dset.cfjson.from_json(json.load(open("/tmp/single_values_no_dimensions.cfjson.txt", "r")))

using single_values_no_dimensions.cfjson.txt results in

ValueError: day is out of range for month

and

ParserError: day is out of range for month: 0

[aportagain]

Will probably also have to fix the xarray variables without-dimensions bit further along the processing?