The blank line shows up after the detail lines that printed and only when the description is long enough that the stretch is needed. And only if two lines of the detail band are needed.

for example

________________________________________
Del Monte Green Beans Regular 79 \
___________________________Sale 69 / works correctly
- two lines of detail band needed
- stretch not needed
________________________________________
Del Monte Greens Beans Regular 79 \
Low Salt Sale 69 blank line after Low Salt
________________________________________/ - two lines of detail band needed
- stretch needed
________________________________________
Del Monte Green Beans Regular 79 \
Low Salt________________________________/ works correctly
- one line of detail band needed
- stretch needed