Fix jest serialization issue (#2642)

[jeremy-davis-sonarsource]

What: fix #2642

Checklist:

• Documentation N/A
• Tests
• Code complete
• Changeset

[changeset-bot]

🦋 Changeset detected

Latest commit: 0dbe9f3

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

This PR includes changesets to release 1 package

Name	Type
@emotion/jest	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.08%. Comparing base (6e0e388) to head (0b695c2).

Additional details and impacted files

Files	Coverage Δ
packages/jest/src/create-serializer.js	100.00% <100.00%> (ø)

[shannonhochkins]

Why isn't this merged? - i have the same issue and this code will fix it for me as well, @jeremy-davis-sonarsource did you ever find another solution for this?

[jeremy-davis-sonarsource]

Why isn't this merged? - i have the same issue and this code will fix it for me as well, @jeremy-davis-sonarsource did you ever find another solution for this?

We simply got rid of the empty classname props. Fortunately, there weren't too many of them (2~3).