KMAIN-1829 Bib Call Number on Holds

KMAIN-1829 Bib Call Number on Holds

Problem: Call Number wouldn't show up in list view of
patron holds screen when status was "Waiting for Copy."

Solution: Add check to Call Number column for specific
copy, and if nonexistant, pull from MARC info for selected
item.

Signed-off-by: Kyle Huckins <khuckins@catalystdevworks.com>
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Modified by berick to avoid bib call number / MARC processing when a
call number is available, since this is already a heavy API call.
Replaced some tabs.  Added some comments.

Signed-off-by: Bill Erickson <berickxx@gmail.com>