JTree shows expansion icon when node hasn't got children

When first displayed, my JTree shows the expansion icon next to non-leaf nodes that do not have children.
If I click on one of the expansion icon it disappears.
How can I stop it displaying this in the first place.
i.e. only display it when the node does have children.
Thanks.

I've had a look at the source code to see why this is happening
javax.swing.plaf.basic.BasicTreeUI.paintExpandControl( ... )
seems to be the source of this effect.
It seems that in deciding whether to display expansion icons or not, it ignores whether or not a node has children up until the node is expanded for the first time.
Surely it should consider whether there are children or not from the beginning.
Is this a bug or is there reasoning behind this? If so what? Is there any workaround.

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