fix: parse fail in empty json

[smellthemoon]

#37200

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.89%. Comparing base (90948e9) to head (ca24bd9).
Report is 29 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/common/Json.h	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37294      +/-   ##
==========================================
- Coverage   83.11%   80.89%   -2.22%     
==========================================
  Files        1029     1319     +290     
  Lines      157231   182670   +25439     
==========================================
+ Hits       130689   147779   +17090     
- Misses      21379    29723    +8344     
- Partials     5163     5168       +5     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	67.12% <50.00%> (∅)
Go	83.15% <ø> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
internal/core/src/common/Json.h	67.90% <50.00%> (ø)

... and 329 files with indirect coverage changes

[xiaofan-luan]

@smellthemoon
need a ut test for this case?

[zhagnlu]

/lgtm

[czs007]

/approve

[sre-ci-robot]

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