Appointments do not have to have equipment

smash/web/models.py

@@ -220,7 +220,8 @@ class Room (models.Model):
 
 class AppointmentType (models.Model):
     required_equipment = models.ManyToManyField(Item,
-        verbose_name='Required equipment'
+        verbose_name='Required equipment',
+        blank = True
     )
     code = models.CharField(max_length=20,
         verbose_name='Appointment code'