only call drawGraph once (#2132)
only call drawGraph once (#2132)


airbnb/caravel,dmigo/incubator-superset,apache/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,nekia/incubator-superset-dev,massgov/incubator-superset,FrederichCheng/incubator-superset,dmigo/incubator-superset,BRD-CD/superset,massgov/incubator-superset,timifasubaa/incubator-superset,mistercrunch/panoramix,ArijanaBrlek/superset,timifasubaa/incubator-superset,apache/incubator-superset,airbnb/caravel,FrederichCheng/incubator-superset,ArijanaBrlek/superset,alanmcruickshank/superset-dev,robert-digit/superset,nekia/incubator-superset-dev,asdf2014/superset,ArijanaBrlek/superset,timifasubaa/incubator-superset,airbnb/superset,timifasubaa/incubator-superset,massgov/incubator-superset,apache/incubator-superset,SingTel-DataCo/incubator-superset,airbnb/superset,dmigo/incubator-superset,mistercrunch/panoramix,BRD-CD/superset,FrederichCheng/incubator-superset,alanmcruickshank/superset-dev,ArijanaBrlek/superset,SingTel-DataCo/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,SingTel-DataCo/incubator-superset,mistercrunch/panoramix,robert-digit/superset,asdf2014/superset,dmigo/incubator-superset,asdf2014/superset,apache/incubator-superset,FrederichCheng/incubator-superset,zhouyao1994/incubator-superset,SingTel-DataCo/incubator-superset,airbnb/superset,nekia/incubator-superset-dev,robert-digit/superset,zhouyao1994/incubator-superset,BRD-CD/superset,zhouyao1994/incubator-superset,BRD-CD/superset,airbnb/superset,massgov/incubator-superset,asdf2014/superset,alanmcruickshank/superset-dev,mistercrunch/panoramix,airbnb/caravel,nekia/incubator-superset-dev,alanmcruickshank/superset-dev,robert-digit/superset