[FEAT] Implementation of [ANALYZER-1711] Avoid empty charts for all-null-or-zero data:
* (protovis band layout) added small visible bars, centered at the axis, for bands with nothing but zero-or-null-values. This affects BarChart, NormalizedBarChart and WaterfallChart.
* (ccc Pie) +InvalidDataException is thrown, in non-multi-chart pie charts, causing a message to be printed, in place of the chart.