fix issue struct attribute converting when has no json name but with omitempty tag

[gqcn]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (34946f6) 79.96% compared to head (5201ede) 79.98%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2486      +/-   ##
==========================================
+ Coverage   79.96%   79.98%   +0.01%     
==========================================
  Files         598      599       +1     
  Lines       49570    49792     +222     
==========================================
+ Hits        39641    39826     +185     
- Misses       7984     8008      +24     
- Partials     1945     1958      +13     

Flag	Coverage Δ
go-1.15-386	80.01% <100.00%> (-0.03%)	⬇️
go-1.15-amd64	80.02% <100.00%> (?)
go-1.16-386	80.04% <100.00%> (+0.02%)	⬆️
go-1.16-amd64	80.03% <100.00%> (+0.04%)	⬆️
go-1.17-amd64	80.02% <100.00%> (?)
go-1.18-386	79.95% <100.00%> (+0.02%)	⬆️
go-1.18-amd64	79.93% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
util/gconv/gconv_map.go	97.08% <100.00%> (+0.02%)	⬆️
contrib/drivers/oracle/oracle.go	79.45% <0.00%> (ø)
contrib/registry/zookeeper/zookeeper_watcher.go	51.11% <0.00%> (+2.22%)	⬆️
os/gfsnotify/gfsnotify_watcher_loop.go	83.19% <0.00%> (+5.04%)	⬆️

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