Fix panic on nil attribute

[samber]

Fixing #48

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.36%. Comparing base (54078d1) to head (78a3912).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   78.22%   78.36%   +0.13%     
==========================================
  Files          11       11              
  Lines         960      966       +6     
==========================================
+ Hits          751      757       +6     
  Misses        177      177              
  Partials       32       32              

Flag	Coverage Δ
unittests	78.36% <100.00%> (+0.13%)	⬆️

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