We got some imports with a missing `url` field generating some errors while trying to retrieve an existing entry with that url.
Introducing the `validateEntry` allow us to dismiss a message when it doesn't have an url (or other missing stuff in the future)
Objects are always passed by reference, so it doesn't make sense to
return an object which is passed by reference as it will always be the
same object. This change makes the code a bit more readable.
Yeah first try was ugly, now each part are in the dedicated place.
Also, the date is hardly truncated to 10 chars because Firefox date are 16 chars long and Chrome are 17 chars long. So instead of divised them by a huge number, I prefer to truncate them.
