NullPointerException on drop

Original [issue 52](https://code.google.com/p/scythebill-birdlist/issues/detail?id=52) created by adam_winer on 2012-08-28T05:56:30.000Z:

Stack trace attached. Doesn't appear severe.

8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: SEVERE: Unhandled exception 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: java.lang.NullPointerException 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at javax.swing.JComponent.repaint(JComponent.java:4748) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at com.scythebill.birdlist.ui.components.TaxonBrowsePanel.doMove(TaxonBrowsePanel.java:252) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at com.scythebill.birdlist.ui.components.BaseTaxonBrowserPanel$TaxonTransferHandler.exportDone(BaseTaxonBrowserPanel.java:263) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at javax.swing.TransferHandler$DragHandler.dragDropEnd(TransferHandler.java:1577) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at java.awt.dnd.DragSourceContext.dragDropEnd(DragSourceContext.java:399) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at sun.awt.dnd.SunDragSourceContextPeer$EventDispatcher.run(SunDragSourceContextPeer.java:432) 8/27/12 10:55:18.455 PM [0x0-0x503503].Scythebill: at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

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