Bug 9503 Correct name of parameter passed to parcel.pl
invoiceid was being passed as invoice causing GetInvoiceDetails
to silently fail and a system error downstream when
accessing the 'orders' element of the undefined invoice
Added an error message if GetInvoiceDetails called on undef
Signed-off-by: Galen Charlton <gmc@esilibrary.com> Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com> Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>