Problem display only posts with comments

your query doesn’t restrict posts without comments.

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    query_posts( 'cat=-8378, -13444&orderby=comment_count&paged=' . $paged );
    while (have_posts()) : 
      if(  get_comments_number() ) the_post();

   [...]

reference: get_comments_number()

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