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/SashRenderer.java
Control[] childCtrls = sashForm.getChildren();
			for (int i = 0; i < childCtrls.length; i++) {
				childCtrls[i].addControlListener(new ControlListener() {
					public void controlMoved(ControlEvent e) {
					}
					public void controlResized(ControlEvent e) {
						
						synchWeights((Control) e.widget);
					}
				});
			}
		}
	}
	/**
	 * Synchronizes the weights of the specified sash form to the underlying
	 * model.
	 * 
	 * @param sf
	 *            the sash form to synchronize
	 */
	private void synchWeightsToModel(SashForm sf) {
		if (sf.isDisposed())
			return;
		
		MSashForm<?> sfm = (MSashForm<?>) sf.getData(OWNING_ME);
		
		int[] ctrlWeights = sf.getWeights();
		EList<Integer> modelWeights = sfm.getWeights();