kkalyan opened a new issue #4080: Iframe visualization broken URL: https://github.com/apache/incubator-superset/issues/4080 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 Explore with Iframe Visualization ### Actual results  Traceback (most recent call last): File "/Users/kkalyan/try/incubator-superset/superset/viz.py", line 265, in get_payload rowcount = len(df.index) AttributeError: 'NoneType' object has no attribute 'index' ### Steps to reproduce Explore with Iframe Visualization
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