false checks for variable , change to not null

services/instance%2Fevent/html.template

@@ -26,7 +26,7 @@
 									{% endif %}
 
 
-									{% if first.main.begin.value != false || first.main.end.value != false %}
+									{% if not first.main.begin.value | null ||  not first.main.end.value | null %}
 									{% if first.main.begin.value == first.main.end.value %}
 									<p><strong>Dato</strong><br>
 										<p>{{first.main.begin.value}}</p>