Fix bug with cypress `testIsolation` option

[JamyGolden]

What:

This fixes a bug where this.get('prev') returns undefined in some scenarios and the command this.get('prev').get('chainerId') throws an error since it's attempting to read get of undefined.

Why:

There is more information about this issue here: https://github.com/testing-library/cypress-testing-library/issues/248, but several people have commented that they are experiencing this. @matt-vendia responded with a solution on that issue, which solves the problem for me too (along with others who thumbs-upped the comment).

How:

Make sure this.get('prev') exists before assuming it's an object.

Checklist:

• [ ] Documentation (n/a)
• [ ] Tests (n/a)
• [x] Ready to be merged

This change is safe and small enough that it is ready to be merged imo.

[github-actions[bot]]

:tada: This PR is included in version 10.0.1 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[leonardobumbeers]

Thanks!

Thank you so much!