OEL-1552: Use field api in template empty check.

templates/content/node--oe-sc-person--full.html.twig

@@ -7,13 +7,13 @@
 <article{{attributes}}>
   <div class="row">
     <div class="col-12 col-lg-10 col-xl-9 col-xxl-8">
-      {% if content.oe_sc_person_additional_info|field_value is not empty %}
+      {% if not node.oe_sc_person_additional_info.isEmpty() %}
         <h2 class="mb-4">{{ 'Additional information'|t }}</h2>
         <div class="mb-4-5">
           {{ content.oe_sc_person_additional_info|field_value }}
         </div>
       {% endif %}
-      {% if content.oe_sc_person_documents|field_value is not empty %}
+      {% if not node.oe_sc_person_documents.isEmpty() %}
         <h2 class="mb-4">{{ 'Related documents'|t }}</h2>
         <div class="mb-4-5">
           {{ content.oe_sc_person_documents|field_value }}