fix: return early from sectorPathUpdate if path is invalid

[fnune]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

In a project, I'm getting Cannot read property '0' of undefined. Sentry report:

Crashed in non-app:
/tmp/build_dfe7ac4f_/node_modules/@antv/g2/esm/animate/animation/sector-path-update.js in getArcStartPoint

This is (superficially) because there's nothing that checks whether toAttrs.path is a valid PathCommand[]. I've added that check with an early return.

[github-actions]

😭 Deploy PR Preview d2119c7 failed. Build logs

_{🤖 By surge-preview}

[coveralls]

Pull Request Test Coverage Report for Build 385643529

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.05%) to 93.423%

---

Files with Coverage Reduction	New Missed Lines	%
src/animate/animation/sector-path-update.ts	1	93.07%

Totals
Change from base Build 384746160:	0.05%
Covered Lines:	10541
Relevant Lines:	10940

---

💛 - Coveralls

[hustcc]

Thanks

[fnune]

No, thank you!