Maker filter, for makers with commas in name are broken

[jamieu]

https://collection.sciencemuseumgroup.org.uk/search/objects/makers/science-museum,-london

[evancp87]

After extensive research I haven't got to the bottom of the issue. The issue is specifically in the Object tabs, Maker filter, with facets containing commas. The exact same facets work fine in the all tab, and there is almost no apparent difference between the code behind the 'all' and 'object' tabs, other than that the 'all' tab returns results, and the other doesn't for some reason.

There is one reason, however, which could be that the maker value seems to be run through a formatValue function in query-params-objects.js, which uses split-commas.js to split on unescaped commas, whereas it isn't in the all tab code. I'm not sure why this is a problem currently, as commenting out the function doesn't change anything, but is a trail to follow in future.