Bug fix for ticket #1109 Waterfall: 0 values get color of last bar. Fixed bug on if/else statement that incorrectly assigned the series paint object for the last bar to a 0 value middle bar. The cause of the problem was that when a middle bar had a value of 0, the if/else statement on valDiff did not cover the case when valDiff was 0 and the column was a middle column.