Fixed Sonar Code smell by reducing nesting

[snakefoot]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 42.85714% with 12 lines in your changes missing coverage. Please review.

Project coverage is 78.60%. Comparing base (9b04c11) to head (0f5e101).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	42.85%	3 Missing and 9 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
+ Coverage   78.38%   78.60%   +0.21%     
==========================================
  Files          19       19              
  Lines        1962     1963       +1     
  Branches      375      376       +1     
==========================================
+ Hits         1538     1543       +5     
+ Misses        257      253       -4     
  Partials      167      167              

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