How to get the last non empty value of a hierarchy?

如何让一个层次的最后一个非空值？

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An empty value for user name and a non-empty value for password.

用户名为空，密码不为空。

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A non-empty value for user name and an empty value for password.

用户名不为空，密码为空。

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There are no empty tank requirements during installation for the non-contacting radar.

非接触式雷达的安装期间没有空罐要求。

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Is the loop non-empty?

循环体是否为空？

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Is the loop non-empty?

循环体是否为空？

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