Fix for Bug 7085 - Problems with searching for orders in acquisitions

Fix for Bug 7085 - Problems with searching for orders in acquisitions

Changing "if ( defined $input )" to "if ( $input )" in the section
of the script which builds the order search query seems to give
successful searches where they didn't exist before. Searches from
the advanced order search screen work with title, author, vendor,
basket number, date, etc.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Searches for date ranges, title and author keywords give
me the correct results now.
(cherry picked from commit 0c0ddf92113b4a5df6833f75ba5b7ad7527c5f48)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>