remove dead code

tiramisu/setting.py

@@ -777,9 +777,6 @@ class Settings(object):
     def setowner(self,
                  owner):
         ":param owner: sets the default value for owner at the Config level"
-        if not isinstance(owner,
-                          owners.Owner):  # pragma: optional cover
-            raise TypeError(_("invalid generic owner {0}").format(str(owner)))
         self._owner = owner
 
     def getowner(self):