a data value without a value is a somehow invalid datapoint
suggestion to consider if changing the type of the DV_SCALE.value from Real to String (so that the key can be used)
suggestion to modelers to consider to use DV_CODED_TEXT in such situation (when a DV_SCALE has no value, perhaps a set of DV_CODED_TEXT sounds more appropriate) - but this will not work for situation where values are used multiple times
not discussed too much, need more feedback
@Sebastian Garde
cannot turn the value to String, rather make the value optional
consider deprecating DV_ORDINAL class ?
it might have huge impact in the future on data instances, and smaller impact on models