Manage list values of res_id

The res_id value returned from an action on the server can be a list or a
number, so it must be converted to a list only when it is not a already.

issue5774
review32411002

src/tab.js

@@ -291,7 +291,10 @@
                 this.set_name(attributes.name || '');
                 this.el.append(screen.screen_container.el);
                 if (attributes.res_id) {
-                    screen.group.load([attributes.res_id]);
+                    if (!jQuery.isArray(attributes.res_id)) {
+                        attributes.res_id = [attributes.res_id];
+                    }
+                    screen.group.load(attributes.res_id);
                     screen.set_current_record(
                         screen.group.get(attributes.res_id));
                     screen.display();