fix: TemplateManager.findAttributeValue对值为空的HTML布尔属性处理错误

[lzyang1995]

Description

修复的问题参考此issue
改动点：

• 将findAttributeValue中的||修改为??
• 对逻辑受影响的地方进行调整（包含两处：packages/core/src/module/resource.ts中的crossorigin，以及packages/core/src/module/app.ts中的no-entry。其他使用findAttributeValue的地方目测不受影响）

Related Issue

#659

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e6832e0) 83.31% compared to head (78ea9fa) 83.31%.

Files	Patch %	Lines
packages/core/src/module/resource.ts	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #660      +/-   ##
==========================================
- Coverage   83.31%   83.31%   -0.01%     
==========================================
  Files          90       90              
  Lines       12492    12494       +2     
  Branches     1931     1935       +4     
==========================================
+ Hits        10408    10409       +1     
- Misses       2069     2071       +2     
+ Partials       15       14       -1     

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