Better default for MAPBOX_API_KEY (#4660)
Better default for MAPBOX_API_KEY (#4660)


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