User feedback on "explore_json" API request failure

[larshelge]

This is a feature request for providing user-facing feedback on failed request for data through the explore_json API endpoint.

Story: A user puts together a chart and clicks "Run query". The query fails for some reason, e.g. because there is no data for the particular query / chart selection. The query currently fails silently with no user feedback and leaves the user wondering why nothing happens.

It would be useful to provide the user with some meaningful feedback in these cases. As an example, display a message "No data found" when there is no data returned for the query.

As an example, the /superset/explore_json/ API request might return HTTP status 400 with a message error: "No data" inside the JSON response. In this case, the "No data" could be displayed to the user.

Based on SuperSet version 0.28.1 connected to a Redshift cluster.

[stale]

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