Bug 16857: Check on item.branches makes more sense

Bug 16857: Check on item.branches makes more sense

The test should be on the existence of the item.branches
method/attribute

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit f38bcf5505e1196c3ae4d2e9d5df523bb07ef281)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 6a7fd3ecdc60b00252fa65cede5cde655312ec98)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>