Build Failedを除外するように

[RyokoIzuta]

resolve #570

変更点

• DefaultVariantSelection の exec でビルド失敗しているものはフィルタリングで除外するようにした
• 上記に伴い，DefaultVariantSelectionTest にテストを追加
• 上記に伴い，同クラスの既存のテストの書き方を変更

[codecov-io]

Codecov Report

Merging #668 into master will increase coverage by 0.03%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #668      +/-   ##
============================================
+ Coverage     79.09%   79.13%   +0.03%     
- Complexity      870      875       +5     
============================================
  Files           137      137              
  Lines          3387     3388       +1     
  Branches        264      264              
============================================
+ Hits           2679     2681       +2     
- Misses          607      611       +4     
+ Partials        101       96       -5

Impacted Files	Coverage Δ	Complexity Δ
...kgenprog/ga/selection/DefaultVariantSelection.java	100% <100%> (ø)	2 <0> (ø)	:arrow_down:
.../jp/kusumotolab/kgenprog/ga/mutation/Mutation.java	91.17% <0%> (-2.95%)	9% <0%> (-1%)
...in/java/jp/kusumotolab/kgenprog/Configuration.java	83.09% <0%> (-1.75%)	27% <0%> (ø)
...ain/java/jp/kusumotolab/kgenprog/KGenProgMain.java	93.47% <0%> (+2.89%)	26% <0%> (+2%)	:arrow_up:
...va/jp/kusumotolab/kgenprog/ga/variant/Variant.java	100% <0%> (+3.7%)	17% <0%> (+1%)	:arrow_up:
...in/java/jp/kusumotolab/kgenprog/OrdinalNumber.java	83.33% <0%> (+25%)	8% <0%> (+3%)	:arrow_up:

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[RyokoIzuta]

レビューありがとうございます． 指摘いただいた変数を削除しました．