STY: fix test style

integrationtests/test_crawler_with_cfoods.py

@@ -68,7 +68,7 @@ class CrawlerTest(unittest.TestCase):
 
         # There should be two DepthTest Properties
         depthtests = exp.get_property("DepthTest")
-        assert depthtests != None
+        assert depthtests is not None
         assert len(depthtests.value) == 2
         depthtest = db.Record(id=depthtests.value[0])
         depthtest.retrieve()