fix: エラーを一度しか出さないように修正

[MikuroXina]

Type of Change:

バグの修正, テストの追加

Details of implementation (実施内容)

#749 のリファクタでエラーが 3 回出てしまうデグレードを起こしていました. そのためエラーが 1 回しか出ないように修正し, そのテストコードを追加しました.

[codecov-commenter]

Codecov Report

Merging #751 (9aaa12e) into main (cdd3fc0) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
- Coverage   72.15%   72.13%   -0.03%     
==========================================
  Files          71       71              
  Lines        4752     4758       +6     
  Branches      468      466       -2     
==========================================
+ Hits         3429     3432       +3     
- Misses        856      861       +5     
+ Partials      467      465       -2     

Flag	Coverage Δ
unittests	72.13% <50.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/service/command/meme.ts	75.16% <50.00%> (-1.06%)	⬇️

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[m1sk9]

OK