fix: check attr is nil prior going copy

[troian]

No description provided.

[codecov]

Codecov Report

Patch coverage: 68.29% and project coverage change: +0.02% 🎉

Comparison is base (f96c282) 3.49% compared to head (5e7dd5e) 3.52%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #74      +/-   ##
========================================
+ Coverage   3.49%   3.52%   +0.02%     
========================================
  Files        276     276              
  Lines      88188   88227      +39     
========================================
+ Hits        3084    3110      +26     
- Misses     84946   84959      +13     
  Partials     158     158              

Files Changed	Coverage Δ
go/node/deployment/v1beta3/resourceunit.go	72.07% <0.00%> (-4.12%)	⬇️
go/node/deployment/v1beta3/resourceunits.go	27.08% <0.00%> (-4.63%)	⬇️
go/manifest/v2beta2/group.go	44.73% <100.00%> (ø)
go/manifest/v2beta2/groups.go	76.27% <100.00%> (+0.83%)	⬆️
go/manifest/v2beta2/service.go	87.14% <100.00%> (ø)
go/node/deployment/v1beta3/groupspec.go	97.39% <100.00%> (+0.42%)	⬆️
go/node/types/v1beta3/attribute.go	74.11% <100.00%> (+1.27%)	⬆️

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