I haven't looked too deeply into this, but have you tried GetPolylines7 (or whatever version you can use for your level of SolidWorks)?
I just tried it, but, unfortunately, both output arrays of the GetPolylines7 method (IView) do not depend on whether the drawing view has any section lines. The method returns geometry of the drawing view itself.
(I use SolidWorks 2014 SP 5.0.)
Do you have any other ideas?