Fix unit tests on staging server

Author: const-cloudinary

tests/image_test.py

@@ -9,7 +9,7 @@
 class ImageTest(unittest.TestCase):
     def setUp(self):
         cloudinary.reset_config()
-        cloudinary.config(cloud_name="test", api_secret="1234")
+        cloudinary.config(cloud_name="test", api_secret="1234", cname=None)
         self.image = CloudinaryImage("hello", format="png")
 
     def test_build_url(self):

tests/utils_test.py

@@ -18,6 +18,7 @@
 class TestUtils(unittest.TestCase):
     def setUp(self):
         cloudinary.config(cloud_name="test123",
+                          cname=None,  # for these tests without actual upload, we ignore cname
                           api_key="a", api_secret="b",
                           secure_distribution=None,
                           private_cdn=False)