Serendipity machine results filtering

[mialondon]

Tasks related to improving the filtering of results back from the API queries

• [ ] Filter out results without images (ideally at query level)
• [ ] De-dupe query results for e.g. related editions or copies of an item
• [ ] Microcopy for results screen if no search results
• [ ] Microcopy for results screen if not many results (probably for wishlist)

[mialondon]

See also https://github.com/chnm/serendipomatic/issues/66 https://github.com/chnm/serendipomatic/issues/117 for related work

An example of de-duping for parent item/parts of the whole item. I tried lyrics for 'There is a light that never goes out' (long story) and got lots of pages from this one item in the results - http://www.europeana1914-1918.eu/en/contributions/3369 but it'd be better just to get the parent item instead of lots of the part/child items (e.g. http://www.europeana.eu/portal/record/2020601/D75A016FA1F513107E98B520F9F9300DF0120357.html?utm_source=api&utm_medium=api&utm_campaign=5QpzDWzoy). We might be able to filter on part/whole in the query, or get the parent ID from the part/child record.