io.pepxml: Fix inferring score when first spectrum_query item does not have search_hit items.

[RalfG]

Fixed

• io.pepxml: Fix inferring score when first spectrum_query item does not have search_hit items (fixes io.pepxml: PSM score cannot be inferred if first spectrum_query items is empty #142)

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.97%. Comparing base (c5960ee) to head (c51c946).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
psm_utils/io/pepxml.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   72.01%   71.97%   -0.05%     
==========================================
  Files          32       32              
  Lines        3245     3247       +2     
==========================================
  Hits         2337     2337              
- Misses        908      910       +2     

Flag	Coverage Δ
unittests	71.97% <33.33%> (-0.05%)	⬇️

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