Fixed a bunch of divide by zero errors that occur when coverage is low (e.g., missing data).
Fixed a bunch of divide by zero errors that occur when coverage is low (e.g., missing data).

I doubt this is the final word on this issue, but I hope the code is more robust. I've tried to generalize it so that it will run on any VCF no matter how low the depth is.
ngcrawford/pypgen