zhaoyongjie opened a new issue #4170: Explore view raise 'unsupported operand types' error when since or until is empty URL: https://github.com/apache/incubator-superset/issues/4170 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 0.23.0dev <img width="1345" alt="screen shot 2018-01-08 at 4 59 58 pm" src="https://user-images.githubusercontent.com/2016594/34664149-71e2246e-f495-11e7-9ed5-12e90bad02db.png";>
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