fix(backend): clips/updateのdescriptionで空文字を許容するように

[kakkokari-gtyih]

What

Why

Fix #15419

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

[github-actions]

このPRによるapi.jsonの差分

差分はこちら

--- base
+++ head
@@ -30467,7 +30467,6 @@
                       "string",
                       "null"
                     ],
-                    "minLength": 1,
                     "maxLength": 2048
                   }
                 },
@@ -31925,7 +31924,6 @@
                       "string",
                       "null"
                     ],
-                    "minLength": 1,
                     "maxLength": 2048
                   }
                 },

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[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 42.15%. Comparing base (389ec63) to head (7e7ffba).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/backend/src/server/api/endpoints/clips/create.ts	25.00%	3 Missing ⚠️
...s/backend/src/server/api/endpoints/clips/update.ts	25.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #15429      +/-   ##
===========================================
- Coverage    42.18%   42.15%   -0.03%     
===========================================
  Files         1610     1610              
  Lines       162112   162116       +4     
  Branches      4055     4037      -18     
===========================================
- Hits         68383    68348      -35     
- Misses       93259    93329      +70     
+ Partials       470      439      -31     

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[kakkokari-gtyih]

コンフリクト解消

[mi-gh-maintainer]

Thank you 🙏