Preserve original exception when loading an invalid config

[arturbosch]

#2841

[codecov]

Codecov Report

Merging #2884 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #2884      +/-   ##
============================================
+ Coverage     80.17%   80.21%   +0.04%     
  Complexity     2417     2417              
============================================
  Files           421      421              
  Lines          7358     7360       +2     
  Branches       1343     1343              
============================================
+ Hits           5899     5904       +5     
+ Misses          764      762       -2     
+ Partials        695      694       -1     

Impacted Files	Coverage Δ	Complexity Δ
...n/kotlin/io/gitlab/arturbosch/detekt/api/Config.kt	100.00% <100.00%> (+13.33%)	0.00 <0.00> (ø)
...itlab/arturbosch/detekt/api/internal/YamlConfig.kt	84.61% <100.00%> (+3.84%)	9.00 <0.00> (ø)

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[schalkms]

Should we add a test case for it?

[arturbosch]

Should we add a test case for it?

Yes! Thanks, also forgot to add the document files