ISTWCMS-6827: remove social media icon HTML from local footer when there are no social media items

src/patterns/03-layouts/site-footer/site-footer.twig

@@ -15,11 +15,15 @@
       </a>
     </div>
     {%  endif %}
+
+    {% if social_media.menu_tree %}
     <div class="uw-site-footer__social-media">
       {% include "@components/menu/menu--social/menu--social.twig" with {
         "social_media_placement": 'local-site-footer',
       } %}
     </div>
+    {% endif %}
+
     <div class="uw-site-footer__content">
       {{ body }}
     </div>