raffas opened a new pull request #4395: [BugFix] #4391 FilterBox: An error 
occurred while rendering the visualization: TypeError: Cannot read property 
'xxx' of undefined
URL: https://github.com/apache/incubator-superset/pull/4395
   I've found the cause of this behaviour of bug #4391
   This seems to be related to the patch #4316. 
   The function query_obj in FilterBoxViz return always None. FilterBox is 
using the new cache system. self.run_extra_query() is executed correctly, but  
after that self.query_obj() will be called, passing None to the function 
get_df_payload(), so no payload.data will be passed to FilterBox itself
   This patch call explicity self.filter_query_obj() in query_obj() function
   I'm new to SuperSet and the caching system that it's implemented. Maybe this 
is not the best fix but I'm surely missing some things about how the new cache 
   Debugging the code run_extra_query() seems to be called two times, one from 
the constructor and the other from the method get_df_payload(). The query will 
be executed two times. 

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