[SOLVED] Adding a blank line to separate the categories listing on the sidebar

Hello
I would like to add a space between each category as they are listed in the sidebar widget. Anyone know how to do this either by editing the PHP directly or in a configuration somewhere.

PS I wanted to do this in a Twitter Widget and was able to do it by editing the PHP page that is used to send the info to a browser and adding a line break in the code.

Thanks