Fix, follow spec, response.userHandle allow null

[PathToLife]

What

Fixes #113

Changes

• Allow null in userHandle, and fixed regressions
• Added a test with null in userHandle

[codecov-commenter]

Codecov Report

Base: 92.90% // Head: 92.94% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (81bfece) compared to base (f6d237d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   92.90%   92.94%   +0.04%     
==========================================
  Files          16       16              
  Lines        5963     5984      +21     
==========================================
+ Hits         5540     5562      +22     
+ Misses        423      422       -1     

Impacted Files	Coverage Δ
lib/toolbox.js	89.82% <ø> (+0.23%)	⬆️
lib/parser.js	88.97% <100.00%> (ø)
lib/response.js	97.56% <100.00%> (+0.01%)	⬆️
lib/validator.js	92.29% <100.00%> (+0.23%)	⬆️

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