GetBooks needs to report when it cannot contact a server

[greenfeld]

1. Start GetBooks on an XO which is not connected to any network (it can be in ad-hoc or Mesh mode).
2. Click on one of the "Catalog" choices in the sidebar.
3. You will be told "Sorry, no books could be found" in the status bar, which is almost meaningless. We should at least say we could not connect to the server although I do not know what kind of "server" we should say it is to keep terms simple ("book server", "catalog server", etc.).

The ideal situation would be for Sugar itself to query a host and figure out if we are online, isolated, behind a redirect firewall, etc., but that is a more complex implementation case.

Seen in 11.3.0 os880/GetBooks-10.

[godiard]

I am not over enthusiastic with the patch, because is complex, and is more spaghetti in a already spaghetti activity, but solves the error.
In the future, we can improve it.