Fix survey module headlines

contao/templates/frontend/member_survey_edit.html.twig

@@ -1,10 +1,12 @@
 {% include '@Survey/frontend/_survey_assets.html.twig' %}
 {% include '@Survey/frontend/_survey_branding.html.twig' %}
 
+{% set moduleHeadline = headline is iterable ? headline.text|default('') : headline|default('') %}
+
 <section class="survey-shell survey-grid">
-    {% if headline.text %}
+    {% if moduleHeadline %}
         <header>
-            <h2>{{ headline.text }}</h2>
+            <h2>{{ moduleHeadline }}</h2>
         </header>
     {% endif %}