LP1793196 Volume batch editor offers MARC call numbers

LP1793196 Volume batch editor offers MARC call numbers

Provide call numbers extracted from the MARC record as options in the
volume batch editor.  Call numbers to extract are based on the load-time
classification scheme, defaulting to Generic ('1') if no default scheme
is applied.

Patch includes additional sanity checks on volume editor utility
functions to avoid console errors referencing undefined values.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Dan Wells <dbw2@calvin.edu>