micimize opened a new issue #8961: e.map is not a function explore view
URL: https://github.com/apache/incubator-superset/issues/8961
 
 
   I encountered #2687 while casting from a table visualization with specified 
columns to a bar chart time series. Refreshing the page gets rid of the issue
   
   ### Expected results
   Moving between viz modes does not crash the slice explorer
   
   ### Actual results
   
   I reproduced #2687 by attempting to switch from a table viz to a time-series 
bar chart viz after creating the chart via the `explore`  button in sql lab, 
and debugged on the exception to see:
   
![image](https://user-images.githubusercontent.com/8343799/72302533-f7625180-362f-11ea-91ba-abbf5735b4b6.png)
   
   #### How to reproduce the bug
   while debugging on all exceptions 
   1. create a table viz with specified columns and no metrics
   2. attempt to switch the viz type to line or time series bar chart
   3. Error should be thrown. You should see that `e` in the console is the 
above structure
    
   ### Environment
   
   (please complete the following information):
   
   - superset version: I'm on a slightly modified fork of `0.34.0`. Others in 
the comments of #2687 corroborate. Would be surprised if it had been fixed
   

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