fix(module: tree): should show all nodes while search value is empty

[ElderJames]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

fixed #3526

💡 Background and solution

📝 Changelog

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🇺🇸 English
🇨🇳 Chinese

☑️ 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
• Changelog is provided or not needed

[github-actions]

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (fd73cc9) 44.09% compared to head (aaf834c) 1.53%.
Report is 5 commits behind head on master.

Files	Patch %	Lines
components/collapse/Panel.razor.cs	0.00%	10 Missing ⚠️
components/collapse/Collapse.razor.cs	0.00%	1 Missing ⚠️
components/input/TextArea.razor	0.00%	1 Missing ⚠️
components/tree/Tree.razor.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #3587       +/-   ##
==========================================
- Coverage   44.09%   1.53%   -42.57%     
==========================================
  Files         566     566               
  Lines       27218   27176       -42     
  Branches     5584    5565       -19     
==========================================
- Hits        12003     417    -11586     
- Misses      14231   26719    +12488     
+ Partials      984      40      -944     

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