fix: jsonMarshal string empty check

[mahendraintelops]

No description provided.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c82e053) 61.86% compared to head (87024ef) 61.35%.

Files	Patch %	Lines
internal/converter/converter.go	0.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
- Coverage   61.86%   61.35%   -0.51%     
==========================================
  Files          66       66              
  Lines        4287     4288       +1     
==========================================
- Hits         2652     2631      -21     
- Misses       1299     1312      +13     
- Partials      336      345       +9     

Flag	Coverage Δ
core	61.35% <0.00%> (-0.51%)	⬇️

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