This patch prevents the loss of notes in serials when generating next serial
Test plan:
1 Create a subscription, fill the notes field for the serial with Expected status and activate the system preference PreserveSerialNotes
2 Click Generate next
3 Check that the notes from the now Late serial are gone and that the new serial doesn't have notes.
4 Apply patch, restart services
5 Edit the serial with Expected status to fill the notes field.
6 Click Generate next
7 Check that the notes from the now Late serial are kepts and that they have been copied to the new serial.
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
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