left part of comparison empty string

services/instance%2Forganization/html.template

@@ -80,7 +80,7 @@
                 <div class="ui list">
                   {% if first.main.birthdate %}<div class="item"><i class="icon asterisk"></i><div class="content">{{first.main.birthdate.value}}</div></div>{% endif %}
                   {% if first.main.deathdate %}<div class="item"><i class="icon"><strong>†</strong></i><div class="content">{{first.main.deathdate.value}}</div></div>{% endif %}
-                  {% if first.main.email.value|length != 0 %}<div class="item"><i class="icon email"></i><div class="content">{{first.main.email.value}}</div></div>{% endif %}
+                  {% if  not first.main.email.value | null %}<div class="item"><i class="icon email"></i><div class="content">{{first.main.email.value}}</div></div>{% endif %}
                 </div>
 
 
@@ -92,7 +92,7 @@
                   {% endfor %}
                 </p>
                 {% endif %}
-
+:
               </div>
 
               <div class="column">