Open file plugins/pub_cats/install.xml in editor and replace line #20
PHP Code:
$result = $sbrDb->all('`title`, `path`', '`level`=1 AND `num_all_articles`>0', 0, 0, 'articles_categories');
with next one
PHP Code:
$result = $sbrDb->all('`title`, `path`', '`level`=1', 0, 0, 'articles_categories');
After that, reinstall plugin 'Publishing Categories'.