Based on observation of different EMF+ files (eg. exported by ChemDraw),
there is minimal value of line width.
This commit is fixing all such import issues.

Change-Id: I5c26a1b511363eb1e429bf770ad0f482b124ecb5
Reviewed-on: https://gerrit.libreoffice.org/37319Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>