fix: Descriptions lost border style when children is falsy

[afc163]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
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🔗 Related issue link

close #47151

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Descriptions lost border style when item's children is falsy.
🇨🇳 Chinese	修复 Descriptions 当 item 的 children 为 null 时丢失单元格右边框样式的问题。

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[github-actions]

Visual Regression Report for PR #47191 Passed ✅

Target branch: master (25eda83)

---

Congrats! No visual-regression diff found

[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	331.45 KB (-33 B 🔽)
./dist/antd-with-locales.min.js	376.99 KB (-253 B 🔽)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (62df041) 100.00% compared to head (a461a67) 100.00%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #47191   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files          732       732           
  Lines        12554     12647   +93     
  Branches      3294      3332   +38     
=========================================
+ Hits         12554     12647   +93     

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[github-actions]

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