fix: not found content should be disabled

[headwindz]

[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
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• Enhancement feature
• Internationalization
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🔗 Related issue link

Cascader组件options为空数组时，暂无数据作为了下拉选项（可选项）

close #27949

💡 Background and solution

Make Not found content disabled, just like it's done in filter nodes.

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Cascader bug that empty data can be selected.
🇨🇳 Chinese	修复 Cascader 空数据可以被选择的问题。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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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[codecov]

Codecov Report

Merging #28062 (f8e0e86) into master (4f811cb) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master    #28062   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          389       389           
  Lines         7339      7340    +1     
  Branches      2045      2097   +52     
=========================================
+ Hits          7339      7340    +1     

Impacted Files	Coverage Δ
components/cascader/index.tsx	100.00% <100.00%> (ø)

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[afc163]

让 暂无数据 不可选中

修复 Cascader 空数据可以被选择的问题。

[headwindz]

让 暂无数据 不可选中

修复 Cascader 空数据可以被选择的问题。

done