Bug 10484: serials-edit.pl not checking for barcode field before checking for barcode...

Bug 10484: serials-edit.pl not checking for barcode field before checking for barcode subfield

The script serials-edit.pl is not checking for the existence of the
barcode field before checking for barcode subfield for autoBarcode =
incremental. If the barcode field doesn't exist, the script dies with
errors.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes tests and QA script.
Checked that adding items on serial receive still works.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 9af08e4e2d2091de489633b3f1c4fb03fcf323cd)
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 1d9ac2b10a96800d301524978f00ee393b5bb75e)
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
(cherry picked from commit 1d9ac2b10a96800d301524978f00ee393b5bb75e)
Signed-off-by: Chris Hall <followingthepath@gmail.com>
(cherry picked from commit d9c39688bcc5f4064763d8e2a6958c94066dbdd8)