跟踪日志发现在eip绑定qos以及修改qos的过程中，有v4ip为空的情况也会执行nat网关的tc规则，v4ip为空规则解析错误，排除该场景。

[mengyu0829]

Signed-off-by: mengyu 595983420@qq.com

Pull Request

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Which issue(s) this PR fixes

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[gemini-code-assist]

Summary of Changes

Hello @mengyu0829, 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!

此拉取请求解决了一个关键的错误，即在EIP的QoS策略应用过程中，当IPv4地址（v4ip）为空时，NAT网关的流量控制（TC）规则会被错误地执行。通过引入一个前置检查，确保只有在v4ip有效时才尝试应用这些规则，从而消除了潜在的解析错误，并增强了QoS策略应用的稳定性。

Highlights

• 修复空v4ip导致QoS规则解析错误的问题: 在EIP绑定或修改QoS策略时，如果v4ip为空，系统会尝试执行NAT网关的tc规则，导致规则解析错误。此PR通过在执行tc规则前检查v4ip是否为空来避免此问题。

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Code Review

这个 Pull Request 修复了一个在 EIP 绑定或修改 QoS 策略时，如果 v4ip 为空字符串会导致 TC 规则解析错误的 Bug。通过在 addEipQoSInPod 函数入口处增加对 v4ip 是否为空的检查，提前返回，避免了后续的错误。

整体修改是正确的，并且解决了问题。我有一个关于日志记录的建议，以提高其清晰度和可调试性。