fix(Model#findAll): don't crash on subQuery and order: [.literal()]

lib/dialects/abstract/query-generator.js

@@ -1225,7 +1225,7 @@ module.exports = (function() {
 
 
         if (Array.isArray(options.order)) {
         if (Array.isArray(options.order)) {
           options.order.forEach(function(t) {
           options.order.forEach(function(t) {
-            if (subQuery && !(t[0] instanceof Model) && !(t[0].model instanceof Model)) {
+            if (subQuery && (Array.isArray(t) && !(t[0] instanceof Model) && !(t[0].model instanceof Model))) {
               subQueryOrder.push(this.quote(t, model));
               subQueryOrder.push(this.quote(t, model));
             }
             }
             mainQueryOrder.push(this.quote(t, model));
             mainQueryOrder.push(this.quote(t, model));