This has couple of drawbacks:
- we use postgres-simple and a raw sql query, opaleye would be better
I guess
- there is a hack for empty query, this should be replaced by
removing the WHERE clause in this case

This is to match the { tag | value } on the frontend.

Merge branch '70-dev-searx-parser' of ssh://gitlab.iscpif.fr:20022/gargantext/haskell-gargantext into dev-merge

Now the job doesn't return 'succeeded' fields when it actually fails.