Issue #3445146 by spryah: default tile title tag to P if there is no other textual content

Closes #3445146

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

@@ -31,7 +31,11 @@
   {% set attributes = attributes.addClass('fr-tile--' ~ background|lower) %}
 {% endif %}
 
-{% set title_tag = title_tag|default('h3') %}
+{% if description or tags_badges or detail %}
+  {% set title_tag = title_tag|default('h3') %}
+{% else %}
+  {% set title_tag = 'p' %}
+{% endif %}
 
 {% if title %}
   <div{{ attributes.addClass('fr-tile') }}>