message: fix is_owner check
diff: @@ -78,7 +78,7 @@ def json_success(json_msg, status=200):
  def is_owner(obj, user):
  """ Check if user is owner of the slice """
  - return obj and obj.owners and user in obj.owners
  + return obj and user in obj.owners
  def check_ownership(obj, raise_if_false=True):
  