location-importer.in: Attempt to provide meaningful AS names if organisation handles...

location-importer.in: Attempt to provide meaningful AS names if organisation handles are missing

A decent amount of autnum objects - especially, but not exclusively in
the APNIC sector - does not contain a link to an organisation handle.

In such cases, this patch is going to use the first description line of
the atunum object in question (if available) as a string for its name.
The overwhelming majority of affected ASNs contains a valuable
information there, so this is almost as good as having an organisation
handle linked to it.

Fixes: #12660
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>