fix: allow empty properties for object

[SMillerDev]

No description provided.

[codecov]

Codecov Report

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

Project coverage is 66.60%. Comparing base (b136659) to head (33da771).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PHPDraft/Out/OpenAPI/OpenApiRenderer.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #680   +/-   ##
=========================================
  Coverage     66.60%   66.60%           
  Complexity      439      439           
=========================================
  Files            26       26           
  Lines          1129     1129           
=========================================
  Hits            752      752           
  Misses          377      377           

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