vylc opened a new issue #4253: [geo] deck.gl vizs only; error when creating new slice from druid datasource URL: https://github.com/apache/incubator-superset/issues/4253 When exploring a druid datasource via a deck.gl visualization (creating new), get an error message: {'NoneType' object has no attribute 'get'} - [ ] I have checked the superset logs for python stacktraces and included it here as text if any - [ ] I have reproduced the issue with at least the latest released version of superset - [ ] I have checked the issue tracker for the same issue and I haven't found one similar ### Superset version 0.23.0rc1 ### Expected results Visualization should be shown ### Actual results Error message - see attached image ### Steps to reproduce 1. Go to Sources->Druid datasources 2. Choose one 3. Change viz type to deck.gl viz 4. Error message appears
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