Problem was: during mailmerge, all paragraphs became list nodes
when the last node in original document (template) was list node.

Change-Id: I8b457c5ef04ab6569e7860deb1f5b3d73dadacd0
Reviewed-on: https://gerrit.libreoffice.org/64955Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>