title: WordPress taxonomy.php not working for custom taxonomy
body: <p>I have a custom post type "certificates" &amp; I have a custom taxonomy "certificate_category" that registered for "certificates" custom post type. here is my definition of taxonomy:</p>
  
  <pre><code>$args = array(
          'labels' =&gt; $labels,
          'hierarchical' =&gt; true,
          'show_ui' =&gt; true,
          'show_admin_column' =&gt; true,
          'query_var' =&gt; true,
          'rewrite' =&gt;array( 'slug' =&gt; 'topics' )
      );
          register_taxonomy('certificate_category', 'certificates', $args);
  </code></pre>
  
  <p>This taxonomy has two terms with names "international" &amp; "interior". I have created taxonomy.php for display "certificate_category" taxonomy (international &amp; interior have same template).</p>
  
  <p>The url for "internatonal" term is  mysit/topics/international &amp; for "interior" term is mysit.com/topics/interior and they both redirect to index.php.</p>
  
  <p>What should I do to show taxonomy.php ?</p>