fix: amd gpu abnormal display

[Zeyi-Lin]

修复这种在非AMD GPU上跑的程序，但显示AMD GPU的情况：

[gemini-code-assist]

Summary of Changes

Hello @Zeyi-Lin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决一个特定问题，即当系统中没有检测到AMD GPU时，程序却错误地报告存在AMD GPU。通过引入一个检查机制，确保只有在实际检测到AMD GPU时才返回相关信息，从而提升了硬件检测的准确性，避免了误报。

Highlights

• 修复AMD GPU显示异常: 解决了程序在非AMD GPU环境下运行时，仍错误显示AMD GPU信息的问题。

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[gemini-code-assist]

Code Review

你好，感谢你对项目的贡献。这个 Pull Request 旨在修复在非 AMD GPU 环境下错误显示 AMD GPU 信息的问题。

你通过在 map_amd_gpu_linux 函数中增加检查，当未找到 AMD GPU 时提前返回，从而解决了这个问题。

我注意到一个小问题，即返回 (None, None) 与函数的类型注解 Tuple[Optional[str], dict] 不符。虽然这能通过异常处理达到预期效果，但代码的可读性可以进一步提高。我提供了一个建议，通过显式抛出异常来使代码意图更清晰，同时保持原有逻辑不变。

总体来说，这是一个有效的修复。请查看我的具体评论。