更新密钥增加判空

562935844@qq.com

2023-09-15 d49e1c7813b25c2bd9701b7bb70dc2add4505030

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<resources>
    <string name="app_name">HDLSDK</string>
    <string name="http_unknown">未知网络错误，请稍后再试</string>
</resources>