Removing Zeroes From A Graph

I have a series of 29 categories, each with a value to make a bar graph. The values aren't large, and a large portion of them are zeroes, I'd say on average about 3/4 have a zero as the respective value. Is there a way to make the bar graph ignore the ones that have a zero value and not put them on? Since every week these numbers can change, I would prefer if the method didn't involve some kind of sorting to get the values that aren't zeroes seperate from the rest.