fix(backend): ハッシュタグのランキングの問い合わせ結果がないときのエラー修正

[tai-cha]

What

resultがないときにundefinedになりlengthが取得できないエラーが起きるので配列になるように直した

Why

fix: #12144

Additional info (optional)

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

All modified and coverable lines are covered by tests ✅

Comparison is base (1d9b5ae) 79.20% compared to head (7ce7ddf) 78.99%.
Report is 2 commits behind head on develop.

❗ Current head 7ce7ddf differs from pull request most recent head ecfe471. Consider uploading reports for the commit ecfe471 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12145      +/-   ##
===========================================
- Coverage    79.20%   78.99%   -0.22%     
===========================================
  Files          939      175     -764     
  Lines       100686    22837   -77849     
  Branches      8203      491    -7712     
===========================================
- Hits         79753    18041   -61712     
+ Misses       20933     4796   -16137     

see 764 files with indirect coverage changes

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[github-actions]

このPRによるapi.jsonの差分

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[syuilo]

🙏🙏🙏