bugfix: jackson serializing can compatible with empty beans

[mz126]

do not throw an error when serializing no public field beans.

version=2.14.0
groupId=com.fasterxml.jackson.core
artifactId=jackson-databind

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.03173%. Comparing base (3586eb1) to head (2251cce).
Report is 1 commits behind head on master.

Additional details and impacted files

@@                  Coverage Diff                  @@
##                master         #70         +/-   ##
=====================================================
- Coverage     70.20626%   70.03173%   -0.17454%     
+ Complexity        4211        4203          -8     
=====================================================
  Files              434         434                 
  Lines            17017       17018          +1     
  Branches          1726        1726                 
=====================================================
- Hits             11947       11918         -29     
- Misses            3957        3981         +24     
- Partials          1113        1119          +6     

Files with missing lines	Coverage Δ
...in/java/com/tencent/trpc/core/utils/JsonUtils.java	78.84615% <100.00000%> (-17.23229%)	⬇️

... and 9 files with indirect coverage changes

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[mz126]

I have read the CLA Document and I hereby sign the CLA