[Website] Fix "undefined" as className #1870
Merged
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Motivation for the change, related issues
I found "undefined" as a class name in the rendered DOM code.

Implementation details
Remove potentially empty prop from string chain to classNames() method.
Testing Instructions (or ideally a Blueprint)
Just open playground. It's on the main page as a wrapper.
Ps. Sorry for the small stuff. I'm trying to find my way around the code :)