Bug 303305 EPS cannot handle being asked for from the application's context
Right now we have this... @Inject @Named(EPartService.PART_SERVICE_ROOT) private MElementContainer<MUIElement> rootContainer; ...which will be 'null' if the question was posed to the application's context. Right now, I cannot use EPS in the SaveHandler because I get an (effectively) useless EPartService (filled with null fields).
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/PartServiceImpl.java
case VISIBLE:
			MPart activePart = getActivePart();
			if (activePart == part) {
				part.setToBeRendered(true);
			} else {
				if (activePart.getParent() == part.getParent()) {
					part.setToBeRendered(true);
					engine.createGui(part);
				} else {
					bringToTop(part);
				}
			}
			return part;
		case CREATE:
			part.setToBeRendered(true);
			engine.createGui(part);
			return part;
		}
		return part;
	}
	private MPart showNewPart(MPart part, PartState partState) {
		part = addPart(part, part);
		MPart activePart = getActivePart();
		if (activePart == null) {
			activate(part);
			return part;
		}
		switch (partState) {
		case ACTIVATE:
			activate(part);