Exclude empty values

[KonradHoeffner]

I don't always have values for some rows (e.g. a English label but no German one) and sparqlify-csv generates empty literals then. Can I leave them out altogether?

SML File:

Create View Template test As
  Construct {
    ?s  a owl:Class;
        rdfs:label ?lde;
        rdfs:label ?len.
}
  
With
    ?s = uri(he:, ?SubjektUri)
    ?lde = plainLiteral(?SubjDe,"de")
    ?len = plainLiteral(?SubjEn,"en")

The output now contains for example:

<x> rdfs:label "my english label"@de.
<x> rdfs:label ""@de.

How can I prevent empty values in the output?