Modified tag listing to only include tags used at least once.
Modified tag listing to only include tags used at least once.

Change based on the work of Matteo Crippa:
http://www.matteocrippa.it/2008/9/Empty-categories-fix-for-bloog

bcherry/adequatelygood,bcherry/adequatelygood,bcherry/adequatelygood,bcherry/adequatelygood,bcherry/adequatelygood