fix: avoid emitting empty rule from block comment

[mxschll]

Description

TIL: Because */ ... /* is CSS comment, it gets carried over wherease // is SASS only and will not end up in the output. Because of that, the */ ... /* causes emission of empty rule blocks which we don't want in this case.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (fe20f7a) to head (a8f4fa3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4921   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files         958      958           
  Lines       31317    31317           
  Branches    11565    11565           
=======================================
  Hits        30585    30585           
  Misses        725      725           
  Partials        7        7           

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