Clear SectionedDetailView "of" property
Clear SectionedDetailView "of" property

so that it respects data.cls_ after "data" property is changed.

foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,foam-framework/foam2