when bDummyContext is true at pre code,and call the rGraphic.SetDummyContext( false ).
so this is unnecessary condition at follow code.

Change-Id: I69da58485fd7b81c9111e188d47b98fe8065fc47
Reviewed-on: https://gerrit.libreoffice.org/41489Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>