Deselect all options that display text matching the argument. That is, when given "Bar" this
           would deselect an option like:

           <option value="foo">Bar</option>

           :Args:
            - text - The visible text to match against

def deselect_by_visible_text(self, text):
        """Deselect all options that display text matching the argument. That is, when given "Bar" this
           would deselect an option like:

           <option value="foo">Bar</option>

           :Args:
            - text - The visible text to match against
        """
        if not self.is_multiple:
            raise NotImplementedError("You may only deselect options of a multi-select")
        matched = False
        xpath = ".//option[normalize-space(.) = %s]" % self._escapeString(text)
        opts = self._el.find_elements(By.XPATH, xpath)
        for opt in opts:
            self._unsetSelected(opt)
            matched = True
        if not matched:
            raise NoSuchElementException("Could not locate element with visible text: %s" % text)