Bug 6539 - When searching the catalogue, if I get no results then hit the Z39.50...

Bug 6539 - When searching the catalogue, if I get no results then hit the Z39.50 search the title field in the pop up window is populated with what I searched for.

If I search for a valid ISBN number and hit the Z39.50 search, the title field
is populated with the ISBN number I searched for. This number should populate
the ISBN field and not the title field.

http://bugs.koha-community.org/show_bug.cgi?id=6539
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
To test:
- Search new ISBN using ISBN search from advanced search page
- 0 results - click on Z39.50 search
- Z30.50 form will have your ISBN in ISBN search option

I am signing off on this, because it's an improvement over the current
behaviour.

I see some  problems though that should perhaps be addressed in a separate
bug or as a follow-up:

If you use th catalog search field and search for an ISBN or
a keyword the right fields of the Z39.50 search form will be populated, but
the search index will be put in front:

ISBN: kw,wrdl: 9783492251495
or
Title: kw,wrdl: koha testing

If you search for ISBN as keyword on the advanced search page, it will
still populate the Title search.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>