failed parse test case no call.data.GT

[cariaso]

failcase.vcf.gz

attached is a test case I've found in the wild. I've trimmed this down to a single line, which fails in that call.data has no .GT

can anyone explain why? or if that might be correct behavior?

it seems this file was generated by

https://github.com/raonyguimaraes/mendelmd https://www.ncbi.nlm.nih.gov/pubmed/28594829