Fix nil comparison for top/bottom
Fix nil comparison for top/bottom

vladlopes/influxdb,li-ang/influxdb,influxdb/influxdb,otoolep/influxdb,archsaber/influxdb,joaopedrotaveira/influxdb,runner-mei/influxdb,daachi/influxdb,mnuessler/influxdb,jipperinbham/influxdb,jonseymour/influxdb,pkittenis/influxdb,li-ang/influxdb,mark-rushakoff/influxdb,pkittenis/influxdb,vladlopes/influxdb,daachi/influxdb,mnuessler/influxdb,joaopedrotaveira/influxdb,influxdata/influxdb,jipperinbham/influxdb,mvadu/influxdb,mvadu/influxdb,arussellsaw/influxdb,influxdb/influxdb,archsaber/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,archsaber/influxdb,otoolep/influxdb,archsaber/influxdb,linearb/influxdb,mvadu/influxdb,jonseymour/influxdb,influxdata/influxdb,linearb/influxdb,daachi/influxdb,mvadu/influxdb,influxdb/influxdb,benbjohnson/influxdb,jonseymour/influxdb,pkittenis/influxdb,mnuessler/influxdb,joaopedrotaveira/influxdb,daachi/influxdb,otoolep/influxdb,arussellsaw/influxdb,linearb/influxdb,jonseymour/influxdb,pkittenis/influxdb,jgeiger/influxdb,apigee/influxdb,chenziliang/influxdb,arussellsaw/influxdb,jgeiger/influxdb,apigee/influxdb,chenziliang/influxdb,otoolep/influxdb,jgeiger/influxdb,benbjohnson/influxdb,apigee/influxdb,chenziliang/influxdb,chenziliang/influxdb,vladlopes/influxdb,runner-mei/influxdb,nooproblem/influxdb,joaopedrotaveira/influxdb,benbjohnson/influxdb,mnuessler/influxdb,arussellsaw/influxdb,otoolep/influxdb,mark-rushakoff/influxdb,jipperinbham/influxdb,runner-mei/influxdb,influxdb/influxdb,joaopedrotaveira/influxdb,apigee/influxdb,jipperinbham/influxdb,apigee/influxdb,jonseymour/influxdb,jipperinbham/influxdb,jgeiger/influxdb,jonseymour/influxdb,mark-rushakoff/influxdb,pkittenis/influxdb,mvadu/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,linearb/influxdb,daachi/influxdb,nooproblem/influxdb,arussellsaw/influxdb,arussellsaw/influxdb,mnuessler/influxdb,mnuessler/influxdb,pkittenis/influxdb,daachi/influxdb,otoolep/influxdb,jipperinbham/influxdb,nooproblem/influxdb,runner-mei/influxdb,benbjohnson/influxdb,jgeiger/influxdb,apigee/influxdb,influxdb/influxdb,linearb/influxdb,nooproblem/influxdb,mvadu/influxdb,jgeiger/influxdb,vladlopes/influxdb