pphszx opened a new pull request #5965: [bugfix] NoneType df has no attribute to_dict in IFrame URL: https://github.com/apache/incubator-superset/pull/5965 iFrame doesn't work, and it seems to be introduced in #5753 Bug replication steps: 1. Change visualization type to iFrame in any Explore view 2. A exception is thrown ``` Traceback (most recent call last): File "/home/eric/Documents/github/incubator-superset/superset/views/core.py", line 1134, in generate_json payload = viz_obj.get_payload() File "/home/eric/Documents/github/incubator-superset/superset/viz.py", line 375, in get_payload payload['data'] = self.get_data(df) File "/home/eric/Documents/github/incubator-superset/superset/viz.py", line 489, in get_data return self.get_df().to_dict(orient='records') AttributeError: 'NoneType' object has no attribute 'to_dict' ```
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