[GitHub] [incubator-superset] john-bodley opened a new pull request #6971: [csv-upload] Fixing message encoding

[GitBox <gi...@apache.org>]

john-bodley opened a new pull request #6971: [csv-upload] Fixing message encoding
URL: https://github.com/apache/incubator-superset/pull/6971
 
 
   This PR fixes an issue where if an error was thrown whilst trying to upload a CSV it would result in a 500 error with the following error, 
   ```
   builtins:TypeError: Object of type Exception is not JSON serializable
   ```
   which provided no context to the user what was invalid with their configuration. The reason for the error was the message which was being flashed was of type `Exception` (which is not JSON encodable) rather than `str`.
   
   to: @graceguo-supercat @michellethomas @mistercrunch @timifasubaa 

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