Preserve colors for each "category" in Pie Charts when filtering in the same report.

[martingo]

Problem: Random color pick in pie charts. I am showing different pie charts of the same listing in the budget and for the same categories I see different colors between graphs. When a category (depending the filter) has no value and is not shown in the pie, then the colors don't match between graphs. Solution: Preserve the colors for each "category" in the pie, so when we put a new pie chart referencing the "categories", i will see the same colors for each for a comparison.