pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

modules/creditmutuel/pages.py

@@ -53,13 +53,16 @@ class LoginErrorPage(HTMLPage):
 class EmptyPage(LoggedPage, HTMLPage):
     pass
 
+
 class UserSpacePage(LoggedPage, HTMLPage):
     pass
 
+
 class ChangePasswordPage(LoggedPage, HTMLPage):
     def on_load(self):
         raise BrowserIncorrectPassword('Please change your password')
 
+
 class VerifCodePage(LoggedPage, HTMLPage):
     def on_load(self):
         raise BrowserIncorrectPassword('Unable to login: website asks a code from a card')