BUG: Can't recreate a user with an email address that was previously …

…removed. The email field is now nullified when deleting a user. Fixes #194

app/api_v2/resources.py

@@ -521,6 +521,7 @@ def delete(self, uuid, current_user):
                 user.deleted = True
                 random_identifier = ''.join(random.choice(string.ascii_lowercase) for i in range(5))
                 user.username = f"{user.username}-DELETED-{random_identifier}"
+                user.email = None
                 user.locked = True
                 user.save()
                 return {'message': 'User successfully deleted.'}