PEP8 Fix : Local variable 'message' might be referenced before assignment

Author: Saumya-Mishra9129

extensions/cpsection/backup/view.py

@@ -224,6 +224,7 @@ def __init__(self, operation, view):
         # check the backend availables, if there are more than one
         # show to the user to select one
         if len(self._view.manager.get_backends()) > 1:
+            message = None
             if operation == OPERATION_BACKUP:
                 message = _('Select where you want create your backup')
             if operation == OPERATION_RESTORE: