Bug 26689: Check for specific template then fallback - printinvoice

This patch adds a check for a more specific ACCOUNT_DEBIT template
(named to match the debit_type_code of the credit line) prior to
falling back to the ACCOUNT_DEBIT template.

Test plan
1/ On a patrons account page use the print option on a series of debit
lines with differing credit types (Overdue, Payout)
2/ Note that the same template 'ACCOUNT_DEBIT' is used for all types
3/ Apply the patch
4/ Run step 1 again and note all still print using ACCOUNT_DEBIT
5/ Add a new notice template under the 'circulation' module with a code
that matches one of your account debit types (OVERDUE, PAYOUT)
6/ Run step 1 again and note that where you have added a specific notice
for that debit type it has been used.

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

members/printinvoice.pl

@@ -56,6 +56,18 @@ output_and_exit_if_error(
 );
 
 my $letter = C4::Letters::GetPreparedLetter(
+    module                 => 'circulation',
+    letter_code            => $debit->debit_type_code,
+    branchcode             => C4::Context::mybranch,
+    message_transport_type => 'print',
+    lang                   => $patron->lang,
+    tables                 => {
+        debits    => $debit_id,
+        borrowers => $patron->borrowernumber
+    }
+);
+
+$letter //= C4::Letters::GetPreparedLetter(
     module                 => 'circulation',
     letter_code            => 'ACCOUNT_DEBIT',
     branchcode             => C4::Context::mybranch,