コメントが空白文字のみだとシンタックスエラーが出るのを修正

[515hikaru]

fix #86

[codecov]

Codecov Report

Merging #91 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   62.37%   62.37%           
=======================================
  Files           2        2           
  Lines         101      101           
  Branches       17       17           
=======================================
  Hits           63       63           
  Misses         34       34           
  Partials        4        4           

Flag	Coverage Δ
unittests	62.37% <ø> (ø)

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