fix: parseObject error causes website broken

[await-ovo]

Summary

fix #847
I'm sorry, this PR crashed the website playground.

const parseObject = (value) =>
  value.split(',').reduce((obj, assignment) => {
    const [left, right] = assignment.split('=')
    return {
      ...obj,
      [left.trim()]: right.trim(),
    }
  }, {})

right in the above function may be undefined, so parseObject will throw an error.

Curious why the error is not visible in the console

Test plan

The playground works even if REPLACE ATTRIBUTES VALUE or SVG PROPS are not set:

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
svgr	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 3, 2023 2:40pm

[await-ovo]

cc @gregberge

[await-ovo]

I'm not sure why the CI is reporting errors, in my local npm run build looks fine

[rhuangabrielsantos]

Please, merge this PR @gregberge