Issue #3497221 by pdureau: Use "is sequence" Twig test to prevent fatal errors...

Issue #3497221 by pdureau: Use "is sequence" Twig test to prevent fatal errors when looping on slots

components/grid_row/grid_row.twig

@@ -6,6 +6,7 @@
   {% set cell_attributes = span_tablet ? cell_attributes.addClass('mdc-layout-grid__cell--span-' ~ span_tablet ~ '--tablet') : cell_attributes %}
   {% set cell_attributes = span_desktop ? cell_attributes.addClass('mdc-layout-grid__cell--span-' ~ span_desktop ~ '--desktop') : cell_attributes %}
   {% set cell_attributes = align ? cell_attributes.addClass('mdc-layout-grid__cell--align-' ~ align) : cell_attributes %}
+  {% set content = content and content is not sequence ? [content] : content %}
   {% for item in content %}
     <div{{ cell_attributes }}>
       {{ item }}

components/image_list/image_list.twig

@@ -4,6 +4,7 @@
 
 {% set gutter_size = gutter_size|default(4) %}
 {% set column_count = column_count|default(5) %}
+{% set images = images and images is not sequence ? [images] : images %}
 
 {% if variant == 'masonry' %}
 {% set masonry_style = 'column-count: ' ~ column_count ~ '; column-gap: ' ~ gutter_size ~ 'px;' %}