page.tpl.php replace is_array($primary_links) with isset($primary_links)

The nav menu links show up as "Array|Array|Array|..." which is not quite what is desired

The following works for me. The rest of the code is 5.1.

41,44d24
< if (isset($primary_links)) :
<

 print theme('links', $primary_links, array('class' => 'links p
rimary-links')) 

< endif;
<

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