Django 1.6 changed the default value of BooleanField from False to None

meetingpoll/models.py

@@ -123,7 +123,7 @@ class Bulletin(models.Model):
 class Vote(models.Model):
     choice = models.ForeignKey(Choice)
     bulletin = models.ForeignKey(Bulletin)
-    voice = models.BooleanField()
+    voice = models.BooleanField(default=False)
     comment = models.CharField(max_length=80, blank=True)
 
     class Meta: