[fix] google engine - ignore new useless result type

searx/engines/google.py

 from cgi import escape
 from urllib import urlencode
 from urlparse import urlparse, parse_qsl
-from lxml import html
+from lxml import html, etree
 from searx.poolrequests import get
 from searx.engines.xpath import extract_text, extract_url
+from searx.search import logger
+
+logger = logger.getChild('google engine')
 
 
 # engine dependent config
 
     # parse results
     for result in dom.xpath(results_xpath):
-        title = extract_text(result.xpath(title_xpath)[0])
         try:
+            title = extract_text(result.xpath(title_xpath)[0])
             url = parse_url(extract_url(result.xpath(url_xpath), google_url), google_hostname)
             parsed_url = urlparse(url, google_hostname)
 
                                 'content': content
                                 })
         except:
+            logger.debug('result parse error in:\n%s', etree.tostring(result, pretty_print=True))
             continue
 
     # parse suggestion