[Koha] some warnings during zebra indexing

[Frédéric Demians]

> /15:45:36-05/02 zebraidx(29319) [warn]
> /etc/koha/zebradb/authorities/etc/dom-config-marc.xml: stylesheet
> authority-zebra-indexdefs.xsl not found in path
>
/etc/koha/zebradb/authorities/etc:/etc/koha/zebradb/etc:/etc/koha/zebradb/marc_defs/unimarc/authorities:/etc/koha/zebradb/lang_defs/fr:/etc/koha/zebradb/xsl

It means you have activated DOM indexing for authorities with a UNIMARC
Koha. But authorities DOM indexing works for MARC21 but doesn't for
UNIMARC. See bug 7421.

Switch to GRS-1 for authorities indexing.