Handle short log lines in FillDataStruct

[PrzemyslawKlys]

Summary

• Guard against short IIS log lines by setting missing fields to null in FillDataStruct
• Add unit test with a short log line to verify graceful handling

Testing

• dotnet build IISParser.sln
• dotnet build IISParser/IISParser.csproj -f net472 (fails: The reference assemblies for .NETFramework,Version=v4.7.2 were not found)
• dotnet test

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https://chatgpt.com/codex/tasks/task_e_68a95c6d670c832eb8bafa5af3a4576b

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.50%. Comparing base (f605b69) to head (166a6d1).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
IISParser/ParserEngine.cs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   86.29%   86.50%   +0.21%     
==========================================
  Files           3        3              
  Lines         124      126       +2     
  Branches       17       18       +1     
==========================================
+ Hits          107      109       +2     
  Misses         13       13              
  Partials        4        4              

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