How to ignore properties that doesn't exist in Binding?

[Kamichanw]

I'm binding some properties to Loader.item.

Loader {
    id: loader
    sourceComponent: comp
    Binding {
        target: loader.item
        property: "prop"
        value: 1
        when: loader.status === Loader.Ready
    }
}

If loader.item doesn't has prop, then the Binding should do nothing, otherwise, pass the value to loader.item. Note that you can't do like

Binding {
        ...
        when: loader.status === Loader.Ready && loader.item.prop !== undefined
}

Because you can't assume that the value of loader.item.prop is not undefined.