Django 1.9 test fixes

Author: thijstriemstra

require_license/tests/settings.py

@@ -151,7 +151,7 @@
         },
         'null': {
             'level': 'DEBUG',
-            'class': 'django.utils.log.NullHandler',
+            'class': 'logging.NullHandler',
         }
     },
     'loggers': {

require_license/tests/test_storage.py

@@ -20,7 +20,7 @@ class StorageTestCase(TestCase):
     Tests for :py:mod:`~require_license.storage`.
     """
     def tearDown(self):
-        if os.path.exists(self.file_path):
+        if hasattr(self, 'file_path') and os.path.exists(self.file_path):
             os.remove(self.file_path)
 
     def assertHeaderEqual(self, version, expectedVersion):