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/SWTPartRenderer.java
Control ctrl = (Control) child.getWidget();
			locallyHide(ctrl);
		}
	}
	private Control getOutermost(Control ctrl) {
		
		
		Composite curComposite = ctrl.getParent();
		Control outerMost = ctrl;
		while (curComposite != null
				&& curComposite.getData(AbstractPartRenderer.OWNING_ME) == null
				&& !(curComposite instanceof Shell)) {
			outerMost = curComposite;
			curComposite = curComposite.getParent();
		}
		return outerMost;
	}
	/**
	 * Restore an existing control to the UI by reparenting it (from 'limbo')
	 * under its new owner
	 * 
	 * @param parent
	 *            The composite to place the control under
	 * @param ctrl
	 *            The control to be restored
	 */
	private void locallyShow(Composite parent, Control ctrl) {
		
		
		Control toReparent = getOutermost(ctrl);