kkalyan opened a new issue #4081: Errors in Demo Dashboards URL: https://github.com/apache/incubator-superset/issues/4081 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 {"GIT_SHA": "1e79e9cd2a064c8a6daa77bb74e549e0b12cf840", "version": "0.23.0dev"} ### Expected results ### Actual results #### Births Dashboard  ``` Traceback (most recent call last): File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 265, in get_payload rowcount = len(df.index) AttributeError: 'bool' object has no attribute 'index' ``` #### Misc Charts  ``` Traceback (most recent call last): File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 262, in get_payload df = self.get_df() File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 87, in get_df query_obj = self.query_obj() File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 1450, in query_obj qry = super(CountryMapViz, self).query_obj() File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 173, in query_obj from_dttm = utils.parse_human_datetime(since) - self.time_shift TypeError: unsupported operand type(s) for -: 'NoneType' and 'datetime.timedelta' ``` ### Steps to reproduce superset load_examples
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