Fix comparisons to None

Diff checked manually.

autopep8 -a -ir -j2 --select=E711 .

This required the "agressive" option because it can change code
behavior.

modules/imdb/test.py

@@ -59,9 +59,9 @@ class ImdbTest(BackendTest):
     def test_get_person_biography(self):
         bio = self.backend.get_person_biography('nm0223033')
         assert bio != ''
-        assert bio != None
+        assert bio is not None
 
     def test_get_movie_releases(self):
         rel = self.backend.get_movie_releases('tt0079980')
         assert rel != ''
-        assert rel != None
+        assert rel is not None