refactor: simplify empty check

[junghoon-vans]

reopen #2291

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.55% 🎉

Comparison is base (77e1c8f) 63.70% compared to head (9b31ffb) 64.25%.
Report is 44 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2329      +/-   ##
==========================================
+ Coverage   63.70%   64.25%   +0.55%     
==========================================
  Files         136      136              
  Lines        7196     7106      -90     
  Branches     1299     1291       -8     
==========================================
- Hits         4584     4566      -18     
+ Misses       2612     2540      -72     

Files Changed	Coverage Δ
zio-http/src/main/scala/zio/http/Path.scala	86.36% <100.00%> (ø)

... and 102 files with indirect coverage changes

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