Bug 299680 Loading model deltas should properly process exception and fallback to the base model
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/Workbench.java
parameters);
					TriggerSequence sequence = bs.createSequence(binding.getKeySequence());
					if (cmd == null || sequence == null) {
						System.err.println("Failed to handle binding: " + binding); 
					} else {
						bs.activateBinding(sequence, cmd);
					}
				}
			}
		}
		if (me instanceof MWindow) {
			MContext contextAware = (MContext) me;
			IEclipseContext c = contextAware.getContext();
			if (c != null) {
				c.set(EPartService.PART_SERVICE_ROOT, me);
			}
		}
		if (me instanceof MElementContainer<?>) {
			EList children = ((MElementContainer) me).getChildren();
			Iterator i = children.iterator();
			while (i.hasNext()) {
				MUIElement e = (MUIElement) i.next();
				processHierarchy(e);
			}
		}
	}
	public void createGUI(MUIElement uiRoot) {
		if (renderer == null) {
			Object newEngine = contributionFactory.create(renderingEngineURI, workbenchContext);
			if (newEngine != null) {