When adding a BrowseSelection to a BrowseRequest, it would be convenient to issue a warning if no facethandler was set for the field the BrowseSelection is being defined on.

ie, issue a warning here: http://code.google.com/p/bobo-browse/source/browse/trunk/bobo-browse/src/com/browseengine/bobo/api/BrowseSelection.java#185