Skipping zero values redux!

Okay, I know a lot has been posted about the way to skip zero or "non-entries" while plotting but I still can't resolve my situation. Let's say this is my data:
Bart 3
Lisa 7
Homer 15
Marge 2
Maggie 0
I created a new column using IF(formula = 0, NA(), formula) which gives me Bart 3 3
Lisa 7 7
Homer 15 15
Marge 2 2
Maggie 0 #NA
So far, so good. The problem comes in plotting. I want to make a pie chart, not a line chart. On the line chart, it skips #NA like it should. On the pie, it still plots both the name and the "#NA" value. If you hover over it with the mouse, it shows up as 0%. I want this value ignored altogether as if it didn't exist. I don't want it the name on the legend or showing up on the chart. I have too much data which changes from month to month to be able to remove entries by hand. Any ideas?

Thanks for the quick reply. I'm checking out the links now.