fix(px2rem): panic when using attribute selector without value

[sorrycc]

Close #1137

Summary by CodeRabbit

• Bug Fixes
  • 修复了css_px2rem.rs中parse_attribute函数对val_str的处理方式，现在在访问其值之前会先检查是否为Some。
  • 简化了parse_attribute中res_str的格式。
• Tests
  • 在模块中添加了一个新的测试test_attribute_selector。

[coderabbitai]

概述

Walkthrough

这次更新主要集中在css_px2rem.rs文件中的功能调整和测试新增上。

Changes

文件路径	变更摘要
crates/mako/src/visitors/css_px2rem.rs	- 在parse_attribute函数中，现在在访问值之前会检查val_str是否为Some。 - 简化了parse_attribute中res_str的格式。 - 在模块中新增了一个名为test_attribute_selector的测试。

诗歌

代码更新如春风拂面，

测试新增如清泉涓涓，

小兔欢跃在代码间，

新功能如花儿绽放，

代码世界充满生机。 🐇🌸

Note

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