fix: guard against undefined accessor in printScale

[ruizdiazever]

• Guard acc param in printScale to prevent crash when z or r scales are not configured but included in activeGetters

activeGetters always includes x, y, z, and r (see chart.svelte.ts:617), but when z or r are not configured, the accessor is undefined, causing acc.toString() to throw:

TypeError: can't access property "toString", acc is undefined
    printScale debug.ts:72
    printDebug debug.ts:100

Fix: add if (acc != null) guard before calling acc.toString().

[changeset-bot]

🦋 Changeset detected

Latest commit: 73feefe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
layerchart	Patch

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[ruizdiazever]

[techniq]

Thanks @ruizdiazever. Care to add a changeset (pnpm changeset) and I'll cut a release with this change.

Not sure why the bundle analysis CI failed, might be a permission issue. I'm taking a look.

[ruizdiazever]

Done! Added the changeset as a patch level change. Thank you for maintaining this awesome library!

[techniq]

Released as 2.0.0-next.65. Thanks again!

[techniq]

This should fix the bundle analysis CI (hopefully) for next time: #877