def get_thumbs_up(review):
    """
    Gets the total thumbs up given.
    
    Parameters
    ----------------
    review : BeutifulSoup object
        The review from metacritic as a BeautifulSoup object.
        
    Returns
    ----------------
    thumbs_up : string
        Returns the number of total thumbs up given as a string.
        If the review doesn't got rated yet, the returned string is empty.
    """
    try:
        thumbs_up = review.find("span", class_="yes_count").text
        if len(thumbs_up) != 0:
            return thumbs_up
        else:
            return ""
    except:
        return ""