Issue #3445147 by spryah: default card title tag to P if there is no other textual content

Closes #3445147

templates/patterns/card/pattern-card.html.twig

@@ -18,7 +18,11 @@
   {% set attributes = attributes.addClass('fr-card--' ~ bg_boxes) %}
 {% endif %}
 
-{% set title_tag = title_tag|default('h3') %}
+{% if description or content or detail or tags_badges or detail_end or footer %}
+  {% set title_tag = title_tag|default('h3') %}
+{% else %}
+  {% set title_tag = 'p' %}
+{% endif %}
 
 {% if title %}
   <div{{ attributes.addClass('fr-card') }}>