Empty overlay data causes crashes.

[Swoorup]

Describe the bug

It's useful to have empty data, especially for streaming cases where you are generating stuff on the fly. It appears that having an empty dataset in the overlay causes crash.

Reproduction

https://codesandbox.io/s/playing-around-6-forked-4sof7y?file=/data-1.json:1465-1487

Steps to reproduce

• Run the reproduction example with the link.
• Empty the overlay spline data

Javascript Framework

no-framework (vanilla-js)

Logs

Log

```shell TypeError Cannot read properties of undefined (reading '1') preSampler unknown calcPrecision https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2169:17 calcSidebar https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2089:24 new Scale https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2335:5 makeScales https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2529:21 new GridMaker https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2564:5 new Layout https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:2625:18 Object.update2 [as chart] https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:10953:32 Events.emitSpec https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:1442:23 eval https://4sof7y.csb.app/node_modules/night-vision/dist/night-vision.umd.cjs:1816:21 ```

Validations

• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a NightVision issue and not a framework-specific issue.
• The provided reproduction is a minimal reproducible example of the bug.

[C451]

Yes, need to skip sampling for precision for empty overlays:
https://github.com/project-nv/night-vision/blob/main/src/core/gridScale.js#L145