auth: prevent stupid issue where outdated cookie usage would trigger …

…error 500 intead of 401, resulting in a ~bug after Yunohost self-upgrade and the webadmin is confused about the API not being up again

moulinette/interfaces/api.py

@@ -388,7 +388,7 @@ def logout(self):
 
         try:
             authenticator.get_session_cookie()
-        except KeyError:
+        except Exception:
             raise HTTPResponse(m18n.g("not_logged_in"), 401)
         else:
             # Delete cookie and clean the session