[FIX] Fix notice

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50362 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Fix Notice appearing in tiki-admin_system.php

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50363 b456876b-0849-0410-b77d-98878d47e9d5