Bug 283340 NPE is thrown when last child of stack is removed
1. Close the 'Outline' view. 2. That stack is now gone. An NPE is logged. java.lang.NullPointerException at org.eclipse.e4.workbench.ui.renderers.swt.StackModelFactory.childRemoved(StackModelFactory.java:315) at org.eclipse.e4.workbench.ui.renderers.swt.StackModelFactory$2.notifyChanged(StackModelFactory.java:265) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:280) at org.eclipse.e4.ui.model.internal.application.MPartImpl.setVisible(MPartImpl.java:457) at org.eclipse.e4.workbench.ui.renderers.swt.StackModelFactory$5.close(StackModelFactory.java:344) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2199) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:327)
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackRenderer.java
});
		}
		return newWidget;
	}
	public void postProcess(MPart<?> part) {
		super.postProcess(part);
		if (!(part instanceof MStack))
			return;
		CTabFolder ctf = (CTabFolder) part.getWidget();
		MPart<?> selPart = ((MStack) part).getActiveChild();
		if (selPart == null)
			return;
		
		CTabItem selItem = findItemForPart(part, selPart);
		if (selItem != null) {
			ctf.setSelection(selItem);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.e4.workbench.ui.renderers.swt.LazyStackFactory#internalChildAdded
	 * (org.eclipse.e4.ui.model.application.MPart,
	 * org.eclipse.e4.ui.model.application.MPart)
	 */
	@Override
	protected void internalChildAdded(MPart parentElement, MPart element) {
		
		super.internalChildAdded(parentElement, element);