fix issue in SliceMap/Maps for package gconv when nil value in map of slice item

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 54.54% and project coverage change: -0.01% ⚠️

Comparison is base (243fe73) 79.17% compared to head (792e488) 79.16%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2857      +/-   ##
==========================================
- Coverage   79.17%   79.16%   -0.01%     
==========================================
  Files         634      634              
  Lines       52423    52428       +5     
==========================================
+ Hits        41506    41507       +1     
- Misses       8855     8858       +3     
- Partials     2062     2063       +1     

Flag	Coverage Δ
go-1.18-386	79.22% <54.54%> (-0.03%)	⬇️
go-1.18-amd64	79.27% <54.54%> (+0.05%)	⬆️
go-1.19-386	79.15% <54.54%> (+0.01%)	⬆️
go-1.19-amd64	79.15% <54.54%> (+0.07%)	⬆️
go-1.20-386	79.23% <54.54%> (+0.03%)	⬆️
go-1.20-amd64	79.23% <54.54%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
util/gconv/gconv_map.go	96.00% <54.54%> (-1.15%)	⬇️

... and 4 files with indirect coverage changes

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