String variables with Missing and Values specified cause a null pointer exception (3.3 Fragment)

[mr16165]

DDI still seems to be produced however. The reason is that they are flagged as CodeRepresentation (as opposed to TextRepresentation). Because of this, in FragmentGenerator (line 416), they are looked up in ‘variableToFrequencyMap’ but not found because only Numeric variables are added to the map.