fix: Skip empty files

[jackylamhk]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 99.92%. Comparing base (cb0462a) to head (b02ad0a).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
datamodel_code_generator/parser/jsonschema.py	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #2157      +/-   ##
===========================================
- Coverage   100.00%   99.92%   -0.08%     
===========================================
  Files           38       38              
  Lines         4259     4262       +3     
  Branches       984      985       +1     
===========================================
  Hits          4259     4259              
- Misses           0        2       +2     
- Partials         0        1       +1     

Flag	Coverage Δ
unittests	99.60% <0.00%> (-0.08%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #2157 will not alter performance

_{Comparing jackylamhk:patch-1 (b02ad0a) with main (cb0462a)}

Summary

✅ 30 untouched benchmarks