fix: allow empty header name

[SMillerDev]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 64.70%. Comparing base (4e2a95d) to head (c978b9e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PHPDraft/Out/OpenAPI/OpenApiRenderer.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #646      +/-   ##
============================================
- Coverage     64.76%   64.70%   -0.06%     
- Complexity      422      423       +1     
============================================
  Files            26       26              
  Lines          1121     1122       +1     
============================================
  Hits            726      726              
- Misses          395      396       +1     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud