fix(module: modal): throwing exception when JS remove element

[ElderJames]

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• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
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• Refactoring
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🔗 Related issue link

fixed #3760

💡 Background and solution

📝 Changelog

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🇨🇳 Chinese

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[github-actions]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.69%. Comparing base (f2c623d) to head (0796d2a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3847      +/-   ##
==========================================
+ Coverage   43.42%   43.69%   +0.26%     
==========================================
  Files         579      576       -3     
  Lines       28298    28069     -229     
  Branches     5759     5712      -47     
==========================================
- Hits        12288    12264      -24     
+ Misses      14990    14804     -186     
+ Partials     1020     1001      -19     

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