LP1051112 - Display lineitem commands menu on empty picklists

Ensure that the lineitem commands drop-down menu appears even when the
picklist is empty.  Previously, the commands were not displayed until
the first lineitem was retrieved.  For empty picklists, of course, there
will be no first lineitem.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>