Remove "NaN is a not valid value"

[6br]

We often see these messages in console.

[6br]

I see these messages when the start position of pangenome bin position is the middle of a component. For example, `19-77` in the default data `run1.B1phi1.i1.seqwish.w100` whose first component is composed of bins `1-24`.

[BonfaceKilz]

Let me work on this. I figured out why while handling another issue.

[6br]

Thanks in advance!