fix: ensure taxonomy widget title is only linked if a taxonomy page exits (#1314)

fix: ensure taxonomy widget title is only linked if a taxonomy page exists

Author: CaiJimmy

layouts/_partials/widget/taxonomy.html

@@ -20,7 +20,7 @@
         {{ partial "helper/icon" $icon }}
     </div>
     <h2 class="widget-title section-title">
-        {{ if $showLink }}
+        {{ if and $showLink $taxonomyPage }}
             <a href="{{ $taxonomyPage.RelPermalink }}">
                 {{ $widgetTitle }}
             </a>