Nan as zero

[pkerpedjiev]

Description

What was changed in this pull request?

• Added an option that lets line tracks treat NaN values as zeros. This lets it render an unbroken line.

With the option on:

With the option off:

Why is it necessary?

Fixes #___

Checklist

• Set proper GitHub labels (e.g. v1.6+, ignore if you don't know)
• Unit tests added or updated
• Documentation added or updated
• Example(s) added or updated
• Update schema.json if there are changes to the viewconf JSON structure format
• Screenshot for visual changes (e.g. new tracks or UI changes)
• Updated CHANGELOG.md

[flekschas]

Thanks for the PR.

There were 3 changes I couldn't interpret. Other the PR looks good 👍