perf(adapters/node): check _hasBody once

[markthree]

It seems to avoid double-checking here, if there are body 🥰

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.02%. Comparing base (a58d7c9) to head (8c8e049).
Report is 203 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #930      +/-   ##
==========================================
+ Coverage   77.83%   79.02%   +1.19%     
==========================================
  Files          47       43       -4     
  Lines        4286     3233    -1053     
  Branches      611      795     +184     
==========================================
- Hits         3336     2555     -781     
+ Misses        933      675     -258     
+ Partials       17        3      -14     

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