Bug 13174 : XSLT fails if, and only if you have an author, linked to an authority

Bug 13174 : XSLT fails if, and only if you have an author, linked to an authority

And only in MARC21

To test:

Only for MARC21 with XSLT on for detail

1/ Find a record that has an authority linked author in it
2/ View the detail page in the opac
3/ Notice bibliographic data is missing
4/ Apply patch
5/ Refresh notice bibliographic data is back

Signed-off-by: David Cook <dcook@prosentient.com.au>
Works as described.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as describe, the details are back!

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>