FilterBox,BigNumber,WorldMap: Handle empty results (#9671)
FilterBox,BigNumber,WorldMap: Handle empty results (#9671)

This change avoids Pandas errors to pop up in chart when no data
is returned (confusing users). In this way a nicer
"No Results etc.." is returned.
apache/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/caravel,zhouyao1994/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,airbnb/superset,apache/incubator-superset,mistercrunch/panoramix,mistercrunch/panoramix,airbnb/superset,airbnb/superset,zhouyao1994/incubator-superset,airbnb/superset,mistercrunch/panoramix,apache/incubator-superset,apache/incubator-superset,apache/incubator-superset