NPE thrown when overriding NewFolderAction inner class of MetalFileChooserUI.
Steps to reproduce:
-------------------
1) Compile and run the attahced code.
2) This will open JFileChooser.
3) Click "New Folder Button", it will give the following exception :

Exception occurred during event dispatching:
java.lang.NullPointerException
        at javax.swing.plaf.metal.MetalFileChooserUI$FileRenderer.getListCellRen
dererComponent(MetalFileChooserUI.java:1137)
        at javax.swing.plaf.basic.BasicListUI.paintCell(BasicListUI.java:126)
        at javax.swing.plaf.basic.BasicListUI.paint(BasicListUI.java:215)
        at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142)
        at javax.swing.JComponent.paintComponent(JComponent.java:541)
        at javax.swing.JComponent.paint(JComponent.java:808)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4795)

        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4748)
        at javax.swing.JComponent._paintImmediately(JComponent.java:4692)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4495)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)

        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(System
EventQueueUtilities.java:117)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:151)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:141)
        at java.awt.Dialog$1.run(Dialog.java:540)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)