telepathyHelper.emergencyCallsAvailable no longer works

I believe it used to.

I wanted to use it to control whether we show the "Emergency" button on the lockscreen.

Here's a sample qml file that you can run like so to reproduce:

qmlscene test.qml --desktop_file_hint=webbrowser-app.desktop

"""
import QtQuick 2.4
import Ubuntu.Components 1.3
import Ubuntu.Telephony 0.1 as Telephony

MainView {
    height: units.gu(20)
    width: units.gu(40)

    Column {
        anchors.fill: parent
        spacing: units.gu(2)

        Label {
            text: "Ready: " + (telepathyHelper.ready ? "yes" : "no")
        }

        Label {
            text: "Emergency Calls Available: " + (telepathyHelper.emergencyCallsAvailable ? "yes" : "no")
        }

        Label {
            text: "Both: " + ((telepathyHelper.ready && telepathyHelper.emergencyCallsAvailable) ? "yes" : "no")
        }
    }
}
"""