reapair code

BeHub/Hub/models.py

@@ -41,7 +41,7 @@ class BeaconManager(models.Model):
 
 class UserProject(models.Model):
     author = models.ForeignKey(User)
-    beacons = models.ManyToManyField('Beacon')
+    beacons = models.ManyToManyField('Beacon', null=True)
     name = models.CharField(max_length=300)
     description = models.CharField(max_length=300, null=True)