Bottom Border Missing from Standard Table on bottom row when cell is blank when exporting to Excel.

We are using Jasper Reports 4.5.1.

The reports look fine in Previewer.

When we export to excel we do not get a bottom cell border drawn when the bottom cell in a column does not have enough text to "stretch" the row height. We have tried setting the row height to a very small number but sometimes the data is null.

We get the bottom cell lines to be drawn, but each detail row consists of multiple Excel rows. See attached.