`gliph-group-scoring` fails to run without "Optional" `--hla HLA_TABLE`

[kamurani]

As described in the documentation, an optional HLA table can be supplied with the following option: --hla HLA_TABLE

However, omitting this command line option and running gliph-group-scoring causes the Usage: help message to be displayed. I have gotten around this by creating an empty file empty_hla.txt and passing this with the command line flag; but this triggers "uninitialized variable" warnings / errors.