added conditionalPolicy

[AlexHaxe]

fixed NPE in C++ after parser failures

[codecov-io]

Codecov Report

Merging #411 into dev will increase coverage by 0.06%.
The diff coverage is 97.75%.

@@            Coverage Diff            @@
##              dev    #411      +/-   ##
=========================================
+ Coverage   91.04%   91.1%   +0.06%     
=========================================
  Files         122     122              
  Lines        8294    8367      +73     
  Branches      303     304       +1     
=========================================
+ Hits         7551    7623      +72     
  Misses        476     476              
- Partials      267     268       +1

Impacted Files	Coverage Δ
...c/checkstyle/checks/whitespace/IndentationCheck.hx	99.12% <100%> (+0.11%)	⬆️
src/checkstyle/checks/block/RightCurlyCheck.hx	97.46% <100%> (+0.43%)	⬆️
src/checkstyle/Checker.hx	84.76% <50%> (-0.61%)	⬇️
src/checkstyle/CheckerPool.hx	100% <0%> (+3.22%)	⬆️

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