fix: improve handling of null and blank values

[fit2-zhao]

fix: improve handling of null and blank values

[f2c-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.31%. Comparing base (0f4453b) to head (2afc381).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
...contract/service/ContractPaymentRecordService.java	0.00%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1531      +/-   ##
============================================
+ Coverage     33.29%   33.31%   +0.02%     
- Complexity     1946     1949       +3     
============================================
  Files           382      382              
  Lines         21892    21929      +37     
  Branches       2309     2317       +8     
============================================
+ Hits           7289     7306      +17     
- Misses        14042    14058      +16     
- Partials        561      565       +4     

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