Bug 25726: make holds to pull ignore holds where found is not null and itemnumber...

Bug 25726: make holds to pull ignore holds where found is not null and itemnumber is null

To test:
1- place 2 bib-level holds on available items
2- confirm they both show on Holds to Pull
3- edit one hold from the database to set found='T'
4- reload Holds to Pull, confirm it is now empty
5- apply patch
6- Reload Holds to Pull
7- confirm it now shows the hold you did not edit

Signed-off-by: donnab <donna@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
[EDIT] Using capitals for SQL reserved words; added a FIXME
Tested with:
    update reserves set found='T', itemnumber=NULL where reserve_id=...
This should be a workaround while we fix the underlying problem.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>