Reworked error behavior for SingleOrDefault.

[michaelstaib]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 14 lines in your changes missing coverage. Please review.

Project coverage is 73.33%. Comparing base (74660d6) to head (2459bcd).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...rc/Data/Projections/SingleOrDefaultMiddleware~1.cs	22.22%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7371      +/-   ##
==========================================
- Coverage   75.54%   73.33%   -2.21%     
==========================================
  Files        2480     2792     +312     
  Lines      123093   139415   +16322     
==========================================
+ Hits        92992   102243    +9251     
- Misses      30101    37172    +7071     

Flag	Coverage Δ
unittests	73.33% <22.22%> (-2.21%)	⬇️

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