diff --git a/src/tests/test_utils_utils.py b/src/tests/test_utils_utils.py
index 36f201bda6..48a9e2c58d 100644
--- a/src/tests/test_utils_utils.py
+++ b/src/tests/test_utils_utils.py
@@ -1,9 +1,12 @@
+# test with game/manage.py test
 import unittest
 
+from src.utils import utils
+
 class TestIsIter(unittest.TestCase):
     def test_is_iter(self):
-        # self.assertEqual(expected, is_iter(iterable))
-        assert True # TODO: implement your test here
+        self.assertEqual(True, utils.is_iter([1,2,3,4]))
+        self.assertEqual(False, utils.is_iter("This is not an iterable"))
 
 class TestCrop(unittest.TestCase):
     def test_crop(self):
diff --git a/src/typeclasses/models.py b/src/typeclasses/models.py
index 76abe19b03..72740198a7 100644
--- a/src/typeclasses/models.py
+++ b/src/typeclasses/models.py
@@ -256,7 +256,7 @@ class AttributeHandler(object):
             "Holds default values"
             def __init__(self):
                 self.value = default
-                self.strvalue = str(default)
+                self.strvalue = str(default) if default is not None else None
 
         if self._cache is None or not _TYPECLASS_AGGRESSIVE_CACHE:
             self._recache()