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- [x] I have checked the superset logs for python stacktraces and included it
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- [x] I have reproduced the issue with at least the latest released version of
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### Superset version
0.18.5
### Expected results
{"error": "Connection failed!\n\nThe error message returned was:\n'NoneType'
object has no attribute 'get'"}
### Actual results
### Steps to reproduce
[ Full content available at:
https://github.com/apache/incubator-superset/issues/5954 ]
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