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
while (it.hasNext()) {
			EObject el = it.next();
			if (el instanceof MApplicationElement) {
				if (el.eResource().getURIFragment(el).equals(id)) {
					return el;
				}
			}
		}
		return null;
	}
	private void init() {
		Activator.trace(Policy.DEBUG_WORKBENCH, "init() workbench", null); 
		
		workbenchContext.set(MApplication.class.getName(), workbench);
		workbench.setContext(workbenchContext);
		
		Activator.trace(Policy.DEBUG_CMDS, "Initialize service from model", null); 
		ECommandService cs = (ECommandService) workbenchContext
				.get(ECommandService.class.getName());
		Category cat = cs
				.defineCategory(MApplication.class.getName(), "Application Category", null); 
		EList<MCommand> commands = workbench.getCommands();
		for (MCommand cmd : commands) {
			IParameter[] parms = null;
			String id = cmd.getId();
			String name = cmd.getCommandName();
			EList<MCommandParameter> modelParms = cmd.getParameters();
			if (modelParms != null && !modelParms.isEmpty()) {
				ArrayList<Parameter> parmList = new ArrayList<Parameter>();
				for (MCommandParameter cmdParm : modelParms) {