event categories must have names

dnscms/events/models.py

@@ -34,7 +34,8 @@ class EventIndex(Page):
 class EventCategory(models.Model):
     name = models.CharField(
         max_length=100,
-        null=True,
+        null=False,
+        blank=False,
     )
     slug = models.SlugField(
         verbose_name=_("slug"),