fix: guard for length check

[jscottsmith]

related: jscottsmith/react-scroll-parallax#233

[vercel]

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Name	Status	Preview	Updated (UTC)
parallax-controller	❌ Failed (Inspect)		Nov 24, 2023 5:55pm

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b9ea98e) 85.52% compared to head (b52b46e) 85.52%.

Files	Patch %	Lines
src/classes/ParallaxController.ts	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #18   +/-   ##
=======================================
  Coverage   85.52%   85.52%           
=======================================
  Files          28       28           
  Lines         739      739           
  Branches      151      151           
=======================================
  Hits          632      632           
  Misses        107      107           

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[github-actions]

size-limit report 📦

Path	Size
dist/parallax-controller.cjs.production.min.js	5.75 KB (+0.35% 🔺)
dist/parallax-controller.esm.js	5.88 KB (+0.42% 🔺)