Don't store temporary mail merge file if mail merge job was cancelled
Don't store temporary mail merge file if mail merge job was cancelled

If a mail merge "to single file" is canceled, the temporary file was still saved.
This needed a lot of time for large mail merge results (>20s) which is not needed,
wanted and inteded. We want mail merge to return asap.

Change-Id: I74e9048c7eb483766e7e677dd21167b7d844a518
Reviewed-on: https://gerrit.libreoffice.org/14811
Reviewed-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>
Tested-by: Michael Stahl <eef8671db506f9731c0438a7613853b6391ca841@redhat.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core