One one hand, a problem since commit
330b8602 (fdo#68787 DOCX import: handle
when w:separator is missing for footnotes, 2013-09-04) was that the type
attribute from <w:footnote w:type="separator"> resulted in two
ooxml:CT_FtnEdn_type tokens, ignoring too many paragraph ends for
footnotes, which resulted in missing paragraph style on footnotes.

On the other hand, fixing the first problem showed that it wasn't
correct that commit 9389cf78 (cp#1000018
RTF import: empty para at the end of footnote text got lost, 2013-11-15)
unconditionally removed the RemoveLastParagraph() call in
DomainMapper_Impl::PopFootOrEndnote(). It turns out that RTF and DOCX
have different semantics here, the footnote is always within a <p></p>
pair in DOCX, while in RTF a \par at the end of a
footnote means an empty paragraph. Fix that by conditionally restoring
the removed RemoveLastParagraph() call.

Change-Id: I33020ac761c94addfec8164a17863565e4453b07