'Returns just a summary message about whether or not this split_test instance has
validation issues (not including superclass validation messages). If the split_test instance
validates correctly, this method returns None.'

def general_validation_message(self, validation=None):

    if (validation is None):
        validation = self.validate_split_test()
    if (not validation):
        has_error = any(((message.type == StudioValidationMessage.ERROR) for message in validation.messages))
        return StudioValidationMessage((StudioValidationMessage.ERROR if has_error else StudioValidationMessage.WARNING), _(u'This    content    experiment    has    issues    that    affect    content    visibility.'))
    return None
