fix #10706 メール送信テスト時に宛先が空のときは送れないようにする

[tar-bin]

What

#10706 の問題を修正しました。

• プレースホルダーを [email protected] に修正
• 管理者メールアドレスをプレースホルダーではなくデフォルト値に変更
• 値が空の時に送信できない(OKボタンを押せない)ように minLength 1 を設定

Why

#10706 の時に送信エラーと誤認するため

Additional info (optional)

ローカル環境で動作確認済みです。

未入力時の表示

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

Merging #10719 (8cff1d2) into develop (f3206d0) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop   #10719   +/-   ##
========================================
  Coverage    76.07%   76.08%           
========================================
  Files          898      898           
  Lines        88717    88742   +25     
  Branches      6259     6263    +4     
========================================
+ Hits         67494    67515   +21     
- Misses       21223    21227    +4     

see 6 files with indirect coverage changes

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[syuilo]

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