order by parse bug

[qsLI]

	// parse ORDER BY
	if(node.getOrderBy().isEmpty()){
		for(SortItem si : node.getOrderBy()/*.get().getSortItems()*/){
			OrderBy ob = si.accept(orderOarser, state);
			if(state.hasException()) return new ParseResult(state.getException());
			orderings.add(ob);
		}
	}

isEmpty => isNotEmpty