Change signal emitted for empty array

import QtQuick 2.3

Item {
    id: root

    property var something: []

    onSomethingChanged: {
        console.log("Something changed!")
    }

    Timer {
        running: true
        interval: 200
        repeat: true
        onTriggered: {
            if (root.something.length !== 0)
            root.something = []
        }
    }
}