~nxg/unity#3: 
Include empty-string as a valid units string

The VOUnits document says 'An empty unit string positively indicates that the corresponding quantity is dimensionless. Since an empty string does not conform to the grammars below, this also must be checked for before unit-parsing starts.'

It might be better to add a special case of 'empty string' to the VOUnits grammar. However this would require coordination with that specification document (cf spec and github)

Status
REPORTED
Submitter
~nxg
Assigned to
No-one
Submitted
3 months ago
Updated
3 months ago
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