Bug 11832: fix JavaScript error on staff client place hold screen if record has no...

Bug 11832: fix JavaScript error on staff client place hold screen if record has no items

If a hold operation is blocked because the title has no items attached
the patron search autocomplete JavaScript triggers an error. This patch
modifies the template so that the JS is loaded only when items are
present.

To test, find a title which has no items attached. View the holds page
for that title. There should be no JavaScript error. Patron search
autocomplete should still work correctly for titles which have items
attached.

Deleted all items from a biblio record. Clicked the holds tab and
confirmed using firebug Javascript error occurs. Applied patch,
confirmed that the Javascript error described in comment 1 no
longer happens. Went to another biblio with items, and confirmed
patron auto-complete still functions.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 0b5b8cef348b61761305dd0bbc574699404c7c69)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>