Fixed rendering issue for unassigned tasks

src/templates/attract/tasks/view_task_embed.jade

@@ -76,7 +76,7 @@
 			placeholder="Assigned to"
 			aria-describedby="task-addon-users")
 				| {% for u in project.users %}
-				| <option value="{{ u._id }}" {% if u._id in task.properties.assigned_to['users'] %}selected{% endif %}>{{ u.full_name }}</option>
+				| <option value="{{ u._id }}" {% if task.properties.assigned_to.users and u._id in task.properties.assigned_to.users %}selected{% endif %}>{{ u.full_name }}</option>
 				| {% endfor %}
 
 		.input-group-separator