fix crashed when press up in DocSearchModal

[vagusX]

[中文版模板 / Chinese template]

🤔 This is a ...

• Site / documentation update

🔗 Related issue link

Fix #31040

Screen.Recording.2021-07-11.at.3.31.32.PM.mov

📝 Changelog

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☑️ 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

[github-actions]

[vagusX]

Related:

• fix(completion): prevent error when getting activeItem with an empty collection algolia/autocomplete#623
• arrow up causing crashed when using @docusaurus/theme-search-algolia facebook/docusaurus#5031 (comment)
• chore(v2): update @docsearch/react facebook/docusaurus#5135

[codecov]

Codecov Report

Merging #31344 (2fbc679) into master (10a8490) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #31344   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          397       397           
  Lines         7570      7570           
  Branches      2134      2134           
=========================================
  Hits          7570      7570           

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[github-actions]

Size Change: 0 B

Total Size: 832 kB

ℹ️ View Unchanged

Filename	Size
./dist/antd-with-locales.min.js	341 kB
./dist/antd.compact.min.css	64.3 kB
./dist/antd.dark.min.css	65.6 kB
./dist/antd.min.css	64.4 kB
./dist/antd.min.js	297 kB

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