QML properties throw a segfaul

[Manuel de la Peña]

The following code raises an exception:

import QtQuick 2.0
import Ubuntu.DownloadManager 0.1
import Ubuntu.Components 1.0

MainView {
    SingleDownload {
        headers: {"Cookie" : "test"}
        Component.onCompleted: {
            download("http://mikeasoft.com")
        }
    }
}