removed a warning if a suite has same test case twice (issue 133)
removed a warning if a suite has same test case twice (issue 133)

fiuba08/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework,ldtri0209/robotframework,waldenner/robotframework,waldenner/robotframework,waldenner/robotframework,waldenner/robotframework,fiuba08/robotframework,fiuba08/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,fiuba08/robotframework