Fix empty map or struct convert to another map will return error.

[joy999]

Fix empty map or struct convert to another map will return error.
After fixed, it will return an empty map, not a nil or error.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ea6a773) 79.15% compared to head (e5b2ddd) 79.16%.
Report is 3 commits behind head on master.

❗ Current head e5b2ddd differs from pull request most recent head 5c6b1f8. Consider uploading reports for the commit 5c6b1f8 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2863   +/-   ##
=======================================
  Coverage   79.15%   79.16%           
=======================================
  Files         634      634           
  Lines       52430    52431    +1     
=======================================
+ Hits        41502    41507    +5     
+ Misses       8864     8861    -3     
+ Partials     2064     2063    -1     

Flag	Coverage Δ
go-1.18-386	79.23% <100.00%> (+0.03%)	⬆️
go-1.18-amd64	79.25% <100.00%> (+0.05%)	⬆️
go-1.19-386	79.12% <100.00%> (+0.06%)	⬆️
go-1.19-amd64	79.13% <100.00%> (+0.02%)	⬆️
go-1.20-386	79.19% <100.00%> (-0.03%)	⬇️
go-1.20-amd64	79.24% <100.00%> (+0.01%)	⬆️

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Files Changed	Coverage Δ
util/gconv/gconv_map.go	96.01% <100.00%> (+<0.01%)	⬆️
util/gconv/gconv_struct.go	82.62% <100.00%> (ø)

... and 6 files with indirect coverage changes

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