Monkey patch a WebOOB bug: No long waiting for the flats to be fetched!
Monkey patch a WebOOB bug: No long waiting for the flats to be fetched!

When passing a `Query` to a WebOOB backend and the query has no cities
for this backend, WebOOB was returning nonsense. This is now solved as
we only call the relevant backends for each query.

Phyks/Flatisfy,Phyks/Flatisfy,Phyks/Flatisfy,Phyks/Flatisfy