'Return full URL (if exists) for a thumbnail property.'

def _get_thumbnail_url(self, property_value):

    if (self._convert_na_to_none(property_value) is None):
        return None
    if ((self._session is None) or (self._session.server is None)):
        return None
    url = self._session.server.url(property_value)
    response = requests.get(url, verify=False)
    if (response and (response.status_code == 200)):
        return url
