Roles are not removed in listmodel

Rolse are not removed using listmodel::clear().
If roles are created using a js-array with different members and added after listModel::clear() roles are still the same.
Sample js-array.
1.

{ text: "My Text", subText: "My subText }

2.

{ text: "My other text" }

If a repeater model is using set using model: ListModel

{id: listModel}

with the js-array 1 and later are clear and set with js-array 2. QML will crash with index of bounds.