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/cragr/browser.py

@@ -228,7 +228,7 @@ class Cragr(BaseBrowser):
         self['numCompteBeneficiaire'] = ['%s' % self.dict_find_value(target_accounts, to)]
         self['montantPartieEntiere']  = '%s'   % amount_euros
         self['montantPartieDecimale'] = '%02d' % amount_cents
-        if reason != None:
+        if reason is not None:
             self['libelle'] = reason
         self.submit()