Hide series data labels?

i have a stacked bar chart with series data labels for each set. i am not displaying value data labels. How can i hide the series data labels if there is a zero value for that series?

in the simplified example attached, you can see that Cami only ate dinner, no lunches. but the stacked bar chart still shows the series label of "lunch". i would like it to not show that label, but be dynamic enough that i can later pull in new data and have the "lunch" label appear if she has eaten (say for example this chart is updated on a monthly basis using vlookups)