Comment 9 for bug 1518346

The problem and fix relates to the specific case where an agg scope includes one child scope multiple times using basic "keyword" declaration:
"order": [
    {
        "keyword":
         {
             "keyword": "nearby.thirsty",
              "department": "dept-thirsty"
         }
    },
...
]

The following worked previously and still works (from News scope):
"order": {
    {
        "category":
         {
            "id": "headlines",
            "department": "dept-headlines",
            "_title": "",
...
            "scopes":
            [
             ],
             "keywords":
             [
                 {
                    "id": "news.headlines",
                    "local_id": "headlines_kw_cat-1"
                 }
             ]
        }
     },
...
]