Eliminate an annoying and useless warning in the JavaScript Console.

Timestamp: 12/10/2013 02:52:51 PM
Warning: Empty string passed to getElementById().
Source File: oils://remote/xul/rel_3_0_20131206_120120/server/OpenILS/global_util.js
Line: 354

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Signed-off-by: Ben Shum <bshum@biblio.org>
Break out of focus() in cat/z3950.js if obj.active_services is undefined.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Signed-off-by: Ben Shum <bshum@biblio.org>