Data labels are useful, but they can clutter a chart, particularly if you have extraneous labels that show "0.00" or "0%" for points that have zero value. You can manually delete these individual labels. But a better solution is to use a custom number format that doesn't display zero values. Double click the labels, select the Number tab, and click on Custom in the left-hand list. A number format generally consists of four format options, separated by semicolons:
[format if positive];[format if negative];[format if zero];[format if text]
Define a custom format that provides no format for zeros to prevent their appearance, such as one of these:
0;;;
0%;;;