Fix setUserAgent when there is no user-agent.

[digifa]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.11%. Comparing base (0dc8920) to head (96566fc).

Files with missing lines	Patch %	Lines
src/EventListener/RequestResponseListener.php	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   96.33%   96.11%   -0.22%     
==========================================
  Files           8        8              
  Lines         436      438       +2     
==========================================
+ Hits          420      421       +1     
- Misses         16       17       +1     

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