Bug 25189: Don't create authority if results found

Bug 25189: Don't create authority if results found

Automatic authority creation assumes that if we don't match we need a new authority.

Using the Default linker, however, we don't match if there exists more than one match.
This leads to repeatedly generating authorities once there is a duplicate in the system

We shoudl instead only create a new authority if there are no results

To test:
1 - Set Linker Module to 'Default'
2 - Enable  AutoCreateAuthorities  and  BiblioAddsAuthorities and  CatalogModuleRelink and LinkerRelink
3 - Add two copies of a single authority via Z39
4 - Add a heading for that authority to a bib record
5 - Save the record and note a new authority is generated
6 - Repeat and see another is generated
7 - Apply patch
8 - Restart all the things
9 - Save the record again, no new authority created

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>