[Explore] Regression: Chart Options missing in Distribution - Bar Chart

[rumbin]

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• I have checked the superset logs for python stacktraces and included it here as text if any
• I have reproduced the issue with at least the latest released version of superset
• I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.20.1

Expected results

Chart Options are visible on the left tool bar, allowing for setting axis labels, bottom margin, legend, etc.

Taking Time Series - Bar Chart as an example:

It is worth noting that this is a regression, since in 0.15.4 the graph could be configured this way — although not with the tabbed interface.

Actual results

The query settings are displayed within the Chart Options tab and not within the Query tab, which is missing entirely.
On the other hand, everything that I'd expect to find in Chart Options is just missing:

Steps to reproduce

Create a slice of visualization type Distribution - Bar Chart and try to set, e.g., the x-axis title.

[rumbin]

I tracked down the issue:

The regression took place from 0.20.0 to 0.20.1.
I.e. in 0.20.0 all options were nicely in place:

[mistercrunch]

Thanks for reporting this high-visibility bug, here's the fix:
#3606