read query params for json in dashboard endpoint (#4337)
read query params for json in dashboard endpoint (#4337)


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