Seitenweberei.ch ha scritto:

Is there a module or any code snippet to hide navigation items if the
corresponing taxonomy term or view doesn't have any nodes assigned? I
searched but couldn't find any.

One solution may be to test if there are nodes for the termX and after display it. (This code is writing without test and only via memory)
<?
if (db_result(db_query("select nid from node where tid = %d limit 0,1",{here the tid of termX})) == 1) {
echo "termX of vocabolary Y";
}
?>

Ok, the code is not well performant, but it is a start.

M.