The documentation says that listbox::item_proxy::empty() tests whether the object is valid. What would have to happen for the object to become invalid? In what conditions would listbox::item_proxy::empty() return true?

The documentation says that `listbox::item_proxy::empty()` tests whether the object is valid. What would have to happen for the object to become invalid? In what conditions would `listbox::item_proxy::empty()` return `true`?

It only checks the pointer which refers to the internal data of listbox, but it doesn't check if the position is right. It seems a bug.

It only checks the pointer which refers to the internal data of listbox, but it doesn't check if the position is right. It seems a bug.
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