Bug 13859: Item search improvements - publication date and title formatting

In the item search accessible from the advanced search the publication
date would not display for MARC21 and the title always contained 'by'
even if there was no author information to display. Also the by is
not needed by MARC21 as the data includes punctuation.

To test:
- Check publication date always displays (MARC21 and UNIMARC)
- Check that for MARC21 the by has been removed from the title information
- Check that for UNIMARC the by only displays when there is also
  an author to display

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Tested for MARC21

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>

koha-tmpl/intranet-tmpl/prog/en/includes/catalogue/itemsearch_item.json.inc

@@ -1,11 +1,12 @@
 [%- USE Branches -%]
+[%- USE Koha -%]
 [%- biblio = item.biblio -%]
 [%- biblioitem = item.biblioitem -%]
 [
   "[% FILTER escape_quotes = replace('"', '\"') ~%]
-    <a href="/cgi-bin/koha/catalogue/detail.pl?biblionumber=[% biblio.biblionumber %]" title="Go to record detail page">[% biblio.title |html %]</a> by [% biblio.author |html %]
+    <a href="/cgi-bin/koha/catalogue/detail.pl?biblionumber=[% biblio.biblionumber %]" title="Go to record detail page">[% biblio.title |html %]</a>[% IF ( Koha.Preference( 'marcflavour' ) == 'UNIMARC' && biblio.author ) %] by[% END %] [% biblio.author |html %]
   [%~ END %]",
-  "[% biblioitem.publicationyear |html %]",
+  "[% (biblioitem.publicationyear || biblio.copyrightdate) |html %]",
   "[% biblioitem.publishercode |html %]",
   "[% biblioitem.collectiontitle |html %]",
   "[% FILTER escape_quotes ~%]