hdt2rdf fails on HDT using TriplesList encoding

[kasei]

In attempting to encode an HDT file using the TriplesList encoding (related to rdfhdt/hdt-java#82), I found that the hdt2rdf tools does not do what I expect when I try to serialize data. This could be a result of my having encoded the HDT file incorrectly, but it's not clear to me what the problem is:

# hdt2rdf /data/foaf.hdt -
ERROR: Empty Value on triple!% / 46.25 %                        

[kasei]

I guess what I'm after here is some way to know from the error messages if the problem is me (my HDT file), or the hdt2rdf implementation. Beyond that, a clear way to generate a valid TriplesList HDT file with the hdt-cpp code would be very helpful. This may already be possible, but I have no idea how to do it, and the documentation doesn't seem to be very thorough for this sort of thing.