unarmedcivilian opened a new issue #10672:
URL: https://github.com/apache/incubator-superset/issues/10672


   I upgraded superset from 0.35.2 to 0.37.0. After the upgrade, I am noticing 
a regression in the UI for multi-select FilterBox. After selecting and removing 
a value, an additional Null item seems to get added to the list. 
   
   ### Expected results
   
   The filter list should not contain invalid values
   
   ### Actual results
   
   The filter list contains an additional `NULL` value
   
   #### Screenshots
   
   <img width="418" alt="Default" 
src="https://user-images.githubusercontent.com/8530446/91180857-cb4e9900-e705-11ea-8977-867c5b043480.png";>
   <img width="261" alt="Select Any Value" 
src="https://user-images.githubusercontent.com/8530446/91180872-d0abe380-e705-11ea-8ba4-2d61f9d50826.png";>
   <img width="271" alt="Deselect" 
src="https://user-images.githubusercontent.com/8530446/91180874-d1dd1080-e705-11ea-98aa-50020480d97c.png";>
   <img width="1052" alt="Select Null" 
src="https://user-images.githubusercontent.com/8530446/91180918-e02b2c80-e705-11ea-83e2-069e6cc170d6.png";>
   
   Selecting the invalid value sends requests with null as the selected value. 
   
   `    "extra_filters": [
           {
               "col": "region",
               "op": "in",
               "val": [
                   null
               ]
           }
       ] `
   
   #### How to reproduce the bug
   
   I am able to reproduce consistently on any dashboard with multi select 
filters. Please refer to screen shots based on the sample dashboards as an 
example.
   
   ### Environment
   
   (please complete the following information):
   
   - superset version: 0.37.0
   - python version:  3.6.12
   - node.js version: `node -v` 
   - npm version: `npm -v`
   
   ### Checklist
   
   Make sure these boxes are checked before submitting your issue - thank you!
   
   - [ ] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [x] I have reproduced the issue with at least the latest released version 
of superset.
   - [x] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   Add any other context about the problem here.
   


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