Ensure that the items added to worklists have the required attributes

It seems that the current checks were sometimes insufficient. This
fixes a bug which intermittently appeared, where the item_id was
missing from the worklist item POST request.

Change-Id: I9bd33b5ce775ba8dee906f931647b68f3582e68c

src/app/worklists/controller/additem_controller.js

@@ -64,6 +64,10 @@ angular.module('sb.worklist').controller('WorklistAddItemController',
                     item_type = 'story';
                 }
 
+                if (!item.hasOwnProperty('value')) {
+                    item.value = item.id;
+                }
+
                 var params = {
                     item_id: item.value,
                     id: $scope.worklist.id,