fix error on parsing createLabel without indexProps/Props
fix error on parsing createLabel without indexProps/Props

daewon/incubator-s2graph,SteamShon/incubator-s2graph,SteamShon/incubator-s2graph,jongwook/incubator-s2graph,daewon/incubator-s2graph,jongwook/incubator-s2graph,SteamShon/incubator-s2graph