Make Mssql errorlog plugin more robust

[Horofic]

Fixes #977

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.72%. Comparing base (f2f50a5) to head (2fa52c8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/os/windows/log/mssql.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #978      +/-   ##
==========================================
- Coverage   77.72%   77.72%   -0.01%     
==========================================
  Files         326      326              
  Lines       28575    28571       -4     
==========================================
- Hits        22210    22206       -4     
  Misses       6365     6365              

Flag	Coverage Δ
unittests	77.72% <75.00%> (-0.01%)	⬇️

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