ktmud opened a new pull request #12905:
URL: https://github.com/apache/superset/pull/12905


   ### SUMMARY
   
   This is probably a little controversial, too.
   
   Sometimes chart plugin `buildQuery` generates invalid `null` values for 
certain props (either because of sloppy code or uncleaned legacy data), making 
the whole query fails:
   
   
![image](https://user-images.githubusercontent.com/335541/106682085-9ed15f80-6576-11eb-8944-72c4b8334aab.png)
   
   
   Since most of the props are optional anyway, maybe we should just make the 
backend more error-tolerant by allowing `null` (`None`) everywhere possible.
   
   ### TEST PLAN
   
   Manually tested by sending API request with null values to 
`/api/v1/chart/data`
   
   ```json
   {
        "datasource": {
                "id": 27,
                "type": "table"
        },
        "force": false,
        "queries": [
                {
                        "time_range": null,
                        "filters": null,
                        "columns": [
                                "season",
                                "episode",
                                "TITLE"
                        ],
                        "metrics": null,
                        "orderby": null,
                        "row_limit": null,
                        "timeseries_limit": null,
                        "order_desc": null,
                        "url_params": null,
                        "post_processing": null
                }
        ],
        "result_format": "json",
        "result_type": "full"
   }
   ```
   
   ### ADDITIONAL INFORMATION
   <!--- Check any relevant boxes with "x" -->
   <!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
   - [ ] Has associated issue:
   - [ ] Changes UI
   - [ ] Requires DB Migration.
   - [ ] Confirm DB Migration upgrade and downgrade tested.
   - [ ] Introduces new feature or API
   - [ ] Removes existing feature or API
   


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