[Issue] 매거진 수정시 categorySlug가 null을 허용하도록 변경

[haroya01]

📝 작업 내용

매거진 수정시 MagazineRequest.Update에서 categorySlug가 null일경우 기존의 slug를 반영하도록 수정했습니다.
추후에 확장과 변경이 용이하도록 더 나은 magazineCategory를 조회 및 magazine에서 category를 수정하는 로직에 대해서 고민해보겠습니다.

🦾 연관된 이슈

jirra이슈

💬리뷰 요구사항

[github-actions]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.14%. Comparing base (f71bf03) to head (b161625).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #169      +/-   ##
=============================================
- Coverage      72.15%   72.14%   -0.01%     
- Complexity      1728     1729       +1     
=============================================
  Files            254      254              
  Lines           6389     6394       +5     
  Branches         296      296              
=============================================
+ Hits            4610     4613       +3     
- Misses          1574     1576       +2     
  Partials         205      205              

Files	Coverage Δ
...xample/codebase/controller/MagazineController.java	91.07% <100.00%> (-0.16%)	⬇️
.../codebase/domain/magazine/dto/MagazineRequest.java	84.78% <ø> (ø)
...ebase/domain/magazine/service/MagazineService.java	91.89% <100.00%> (+0.71%)	⬆️

... and 1 file with indirect coverage changes

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