Merge branch 'feature/ISTWCMS-6546-ebremner-fix-additional-options' into '1.1.x'

ISTWCMS-6546: fixing node template for comparing revisions

See merge request !112

templates/node/node.html.twig

@@ -81,7 +81,7 @@
 ]
 %}
 
-{% if ical %}
+{% if ical and node_data is not empty %}
   {% set node_data = node_data | merge({'ical': ical}) %}
 {% endif %}