Add topics to Interface. Fix id of interface objects being incorrect if package is empty.
Add topics to Interface.
Fix id of interface objects being incorrect if package is empty.

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