Fix wrong Jinja test

templates/main.html

@@ -3,7 +3,7 @@
 {% block title %}Nominate{% endblock %}
 
 {% block content %}
-{% if inst is None %}
+{% if inst is none %}
 <div class="alert alert-danger" role="alert">Sorry, there is currently no nomination process running.</div>
 {% elif not inst.enabled %}
 <div class="alert alert-warning" role="alert">Sorry, you cannot nominate for {{ inst.name }}, currently. The results will be announced at {{ inst.date }}.</div>