Bug 7225 - "Delete all items" should be greyed out when a title has no items

Bug 7225 - "Delete all items" should be greyed out when a title has no items

This patch changes the catalog toolbar so that when there are no
items attached to a record the "Delete all items" menu item appears
to be disabled. Clicking it will trigger an alert, "This record
has no items."

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit 3be1252e1bab40bd43821e66e2cfc69471e24132)

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