fixed null pointer issue in ReporterManager, fixes #517

[AlexHaxe]

No description provided.

[codecov]

Codecov Report

Merging #518 (ba9c5c2) into dev (4bdebcc) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head ba9c5c2 differs from pull request most recent head 75ad09f. Consider uploading reports for the commit 75ad09f to get more accurate results

@@            Coverage Diff             @@
##              dev     #518      +/-   ##
==========================================
- Coverage   89.20%   89.18%   -0.02%     
==========================================
  Files         107      107              
  Lines        7381     7381              
  Branches      934      934              
==========================================
- Hits         6584     6583       -1     
  Misses        404      404              
- Partials      393      394       +1     

Impacted Files	Coverage Δ
src/checkstyle/CheckerPool.hx	92.30% <0.00%> (-7.70%)	⬇️

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