Bug 12898 - Z39.50 title search doesn't work with multiple words

Bug 12898 - Z39.50 title search doesn't work with multiple words

This fixes regression introduced by Bug 6536 so that multiple
words in title search will work.

Test scenario:

1. try z39.50 search with more than one word
2. verify that no results apper
3. apply patch and re-run search
4. verify that there are results

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