willbarrett opened a new pull request #9497: Fix broken MultiLine chart
URL: https://github.com/apache/incubator-superset/pull/9497
 
 
   ### CATEGORY
   
   Choose one
   
   - [X] Bug Fix
   - [ ] Enhancement (new features, refinement)
   - [ ] Refactor
   - [ ] Add tests
   - [ ] Build / Development Environment
   - [ ] Documentation
   
   ### SUMMARY
   <!--- Describe the change below, including rationale and design decisions -->
   The lines altered in this PR were introduced 8 days ago in this commit: 
https://github.com/apache/incubator-superset/commit/f0f4f7e91df0adc3a76292381f1ef6a8f579af95
   
   These lines broke
   
    the Multi Line visualization, as that visualization has no `from_dttm` or 
`to_dttm` attributes. MultiLine visualizations on current master display the 
error `'MultiLineViz object has no attribute 'from_dttm'`.
   
   ### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
   <!--- Skip this if not applicable -->
   Before:
   ![Screen Shot 2020-04-09 at 12 11 20 
PM](https://user-images.githubusercontent.com/1779034/78934522-ef178800-7a5f-11ea-8e27-b5c36759b6a7.png)
   After:
   ![Screen Shot 2020-04-09 at 12 45 32 
PM](https://user-images.githubusercontent.com/1779034/78934580-08b8cf80-7a60-11ea-8a44-4d7d1d98c908.png)
   
   
   ### TEST PLAN
   <!--- What steps should be taken to verify the changes -->
   I've manually tested the change locally. You can verify the fix by 
navigating to:
   Dashbaoards -> Misc Charts
   and scrolling to the bottom where the "Multi Line" chart is displayed.
   
   I'm going to look into adding a unit test for this next.
   
   ### 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
   
   ### REVIEWERS
   @villebro @dpgaspar

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