VCF automatic detection of index fails

What happens

• Segmentation fault when opening a VCF file with egglib.io.VCF.

How does it happen

• The error seems to be caused by the fragment of code that attempts to open the input file with an index and tries again without index when it fails. Possible caused by an update of HTSLIB.

What is the result

• Segmentation fault.

You can add labels below if you know what module is concerned