Fixed GroupBy check in TreeIndex.
Fixed GroupBy check in TreeIndex.

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