Oxystin opened a new issue #4786: [Annotation] ERROR: 'NoneType' object has no attribute 'to_dict' URL: https://github.com/apache/incubator-superset/issues/4786 Make sure these boxes are checked before submitting your issue - thank you! - [x] I have checked the superset logs for python stacktraces and included it here as text if any - [x] I have reproduced the issue with at least the latest released version of superset - [x] I have checked the issue tracker for the same issue and I haven't found one similar ### Superset version 0.23.2 ### Actual results 1) Create superset annotation: <img width="893" alt="screen shot 2018-04-08 at 18 52 11" src="https://user-images.githubusercontent.com/16529413/38469551-41c4ef80-3b5f-11e8-8c06-0f614bebb8f3.png"> 2) Build a line chart and apply a superset annotation layer: <img width="982" alt="screen shot 2018-04-08 at 18 51 15" src="https://user-images.githubusercontent.com/16529413/38469576-a4a34ef8-3b5f-11e8-8339-fc67a1264f29.png"> 3) Get the error : 'NoneType' object has no attribute 'to_dict.
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