LP1896083 Staff catalog handles not-found barcodes

LP1896083 Staff catalog handles not-found barcodes

Staff catalog => Numeric Search => Item Barcode

Display the standard 'No Maching Items Were Found' message when a
barcode search returns no results.

Prior to this patch, the search progress indicator would freeze as the
page failed to completely render on JS error.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Mary Llewellyn <mllewell@biblio.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>