Color Consistency in chart

[khtruong]

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• I have checked the superset logs for python stacktraces and included it here as text if there are 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

Latest

Expected results

When I save a chart, the same colors should correspond to the same data values when I revisit the chart.

When I explore a chart from a dashboard, I want the same colors corresponding to the same data values as seen in the chart in the dashboard.

Actual results

Colors can sometimes be inconsistent.

Steps to reproduce

1. Create a chart.
2. Choose a color scheme.
3. Make some changes that will remove a data value.
4. Save the chart.
5. Revisit the chart.
6. New colors will be assigned to different data values.

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