do not convert value to lowercase when looking up color (#6384)
do not convert value to lowercase when looking up color (#6384)


airbnb/superset,mistercrunch/panoramix,airbnb/superset,zhouyao1994/incubator-superset,airbnb/superset,apache/incubator-superset,zhouyao1994/incubator-superset,apache/incubator-superset,airbnb/caravel,apache/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,apache/incubator-superset,airbnb/superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,apache/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,mistercrunch/panoramix,mistercrunch/panoramix