[Development] How to skip write property in qml's property binding?

[JiDe Zhang]

For an example:

Text {
    text: fooObject?.title
}

When the fooObject is null, will got a qml error "Unable to assign [undefined] 
to QString".

I don't want the error, so, how to skip write value for "text" property when 
fooObject is null?

Text {
    text: fooObject?.title ?? text
}

This is a workaround, but it is a magic, maybe will got a cycle binding?

Text {
    text: fooObject?.title ?? bypass
    objectName: {
       if (fooObject)
            return fooObject.name
       bypass
    }
}

This syntax will more easily understand.

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