Handle incomplete query

depicts/model.py

@@ -111,8 +111,9 @@ class WikidataQuery(Base):
     error_text = Column(String)
     query_template = Column(String)
 
-    @hybrid_property
+    @property
     def duration(self):
+        if self.end_time:
             return self.end_time - self.start_time
 
     @property

templates/query_list.html

@@ -25,7 +25,11 @@
     {% if obj.status_code != 200 %}{% set class=" text-light bg-danger"%}{% endif %}
     <div class="row">
       <div class="col-2{{ class }}">
+        {% if obj.end_time %}
           {{ obj.start_time.strftime('%Y %b %d %H:%M') }}
+        {% else %}
+          running
+        {% endif %}
       </div>
       <div class="col-4"><a href="{{ obj.path }}">{{ obj.path }}</a></div>