Commit c761df1e (tdf#84678 DOCX import:
fix handling of textbox margins, 2016-10-25) uncovered a previously
harder to notice problem that single-paragraph shapes have an incorrect
upper paragraph margin for the first paragraph. Now that the shape
margins are correct this problematic paragraph margin causes crop of the
shape text.

Fix the problem by adapting the DOCX import to the WW8 import's
SwWW8ImplReader::AppendTextNode() (the "If this is the first paragraph
in the document" part), where it seems the first paragraph is not only
the literally first paragraph in the document, but also the first
paragraph of shapes as well.

Change-Id: I9d99b9cfabae2c9a7c33eefefb5a9f008669e93d
Reviewed-on: https://gerrit.libreoffice.org/49617Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>