Hi, i also had this issue, i found a solution: use the pie chart message calling piechart template with no data on the container you want to show "No Data" message, without know about how to show this message on other kind of charts:
drawPieTemplate(array1,container1);
if (array2.length==0){
drawPieTemplate(array2,container2);
} else {
drawBarTemplate(array2,container2);
}
My suggestion is to prepare pietemplate, bartemplate, columntemplate, ... functions with data and container as parameters so you can do it easily!
Alessandro