Verifies that current page not contains `text`.

        If this keyword fails, it automatically logs the page source
        using the log level specified with the optional `loglevel` argument.
        Giving `NONE` as level disables logging.

def page_should_not_contain_text(self, text, loglevel='INFO'):
        """Verifies that current page not contains `text`.

        If this keyword fails, it automatically logs the page source
        using the log level specified with the optional `loglevel` argument.
        Giving `NONE` as level disables logging.
        """
        if self._is_text_present(text):
            self.log_source(loglevel)
            raise AssertionError("Page should not have contained text '%s'" % text)
        self._info("Current page does not contains text '%s'." % text)