Logs tab: disable the Clear / Save log / Add all to list buttons when no articles in log

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code@9267 5227b50d-9349-4574-b055-4b0a7525e11c
List maker: disable Remove & Filter buttons when no articles in list

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code@9268 5227b50d-9349-4574-b055-4b0a7525e11c