Yes, there is a way to hide zero entries from the legend in Excel. Here are the steps:

1. Select the chart by clicking on it.
2. Click on the "Select Data" option in the "Data" section of the "Chart Tools" tab.
3. In the "Select Data Source" dialog box, click on the "Hidden and Empty Cells" button at the bottom left corner.
4. In the "Hidden and Empty Cell Settings" dialog box, select the "Show data in hidden rows and columns" option.
5. Click OK to close the dialog boxes.

Now, any data with a zero value will be hidden from the legend. If you want to show the data again, simply change the value to a non-zero number.