AdvancedSearch: Querying topCollections with curated results throws error

[michaelbromley]

When performing a search query and selecting the topCollections field, and curated results in the result set will cause an error to be thrown.

The root cause seems to be that we attempt some Math operations on the text_match field (which is normally a number) but for curated results this is not numeric, resulting in a "score" of NaN, which in turn causes the GraphQL layer to return:

{
  "errors": [
    {
      "message": "Int cannot represent non-integer value: NaN",
      "locations": [
        {
          "line": 42,
          "column": 7
        }
      ],
      "path": [
        "search",
        "topCollections",
        0,
        "score"
      ]
    }
  ]
}