Qml ListView currentIndex wrong when assigning empty model

when explicitly setting a view's model to an empty array (or an empty
ListModel, C++-Model, etc.) the currentIndex property changes from -1
to 0. Initializing the model property with an empty model works as
expected.

import QtQuick 2.0

Rectangle {
  width: 360
  height: 360

  ListView {
    id: view
    anchors.fill: parent
    // model: [] // this works, currentIndex will be -1
    delegate: Text {
      text: modelData
    }
  }

  Text {
    anchors { right: parent.right }
    text: view.currentIndex
    MouseArea {
      anchors.fill: parent
      onClicked: view.model = [] // now currentIndex becomes 0
    }
  }
}

This looks like a bug to me because 0 is obviously not a valid index for an
empty model. It's the same behavior in QtQuick 1 and QtQuick 2.

The same problem occurs when assigning an empty Qml ListModel.