LP#1078787 Fix serial scoping in TPAC

If you have generated holdings, but are not using the "compressed"
display, your holdings show up regardless of scope.  This change
limits the display to only sdists with a holding_lib in your current
search scope.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Fix currently harmless but still confusing sigil error

get_org_descendants() returns an array ref, not a list, so it doesn't
make sense to assign it to an '@orgs' variable.  Lucky for us, our
where-parser treats this single element list containing the ref in the
same manner as the proper ref itself, but at best, it is still very
confusing to see.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>