Ensure active_ids is always a list

issue11088
review395191003
(grafted from 24eab059161d2194fc16a900ef397c0ba406b9b3)

--HG--
branch : 6.0

src/action.js

@@ -73,7 +73,7 @@
                 var ctx = {
                     active_model: data.model || null,
                     active_id: data.id || null,
-                    active_ids: data.ids
+                    active_ids: data.ids || [],
                 };
                 ctx = jQuery.extend(ctx, session.context);
                 ctx._user = session.user_id;