make MoreAboutRequestorTicketList None work

Previously the comp_exist check for "ShowRequestorTicketsNone" failed and set
$TicketTemplate to the default "ShowRequestorTicketsActive".
Fixing this by treating MoreAboutRequestorTicketList set to None the same way
as if $ShowTickets where set to a false value.
don't sort status and lookup a component if we don't need it

If we know we are not showing any requestor tickets there is no need for status
sorting and component lookups.
Merge branch '4.2/more-about-requestor-tickets' into 4.2-trunk