Fixed Histogram visualization bug.  (#8077)
Fixed Histogram visualization bug.  (#8077)

* Fix HistogramViz bug.

* Fix ci black error.

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