graby will throw an Exception in some case (like a bad url, a restricted url or a secured pdf).
Import doesn't handle that case and break the whole import.
With that commit the import isn't stopped but the entry is just skipped.
Also, as a bonus, I've added extra test on WallabagImportV2 when the json is empty.
Instead of using a HTTP request we just login user like FOSUser does.
It allows us to mock service in container for functional tests.
Also, fix a bad config name in fos_user for firewall
And finally, add functional test to PocketImport
