Fix NoneType bug & fill the test recipients with original recipients if empty (#7365)
Fix NoneType bug & fill the test recipients with original recipients if empty (#7365)


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