[fix] startpage engine compatibility

searx/engines/startpage.py

@@ -1,4 +1,4 @@
-## Startpage (Web)
+#  Startpage (Web)
 #
 # @website     https://startpage.com
 # @provide-api no (nothing found)
@@ -17,8 +17,11 @@ import re
 
 # engine dependent config
 categories = ['general']
-# there is a mechanism to block "bot" search (probably the parameter qid), require storing of qid's between mulitble search-calls
-#paging = False 
+# there is a mechanism to block "bot" search
+# (probably the parameter qid), require
+# storing of qid's between mulitble search-calls
+
+# paging = False
 language_support = True
 
 # search-url
@@ -44,7 +47,8 @@ def request(query, params):
 
     # set language if specified
     if params['language'] != 'all':
-        params['data']['with_language'] = 'lang_' + params['language'].split('_')[0]
+        params['data']['with_language'] = ('lang_' +
+                                           params['language'].split('_')[0])
 
     return params
 
@@ -57,7 +61,10 @@ def response(resp):
 
     # parse results
     for result in dom.xpath(results_xpath):
-        link = result.xpath(link_xpath)[0]
+        links = result.xpath(link_xpath)
+        if not links:
+            continue
+        link = links[0]
         url = link.attrib.get('href')
         title = escape(link.text_content())
 
@@ -66,7 +73,8 @@ def response(resp):
             continue
 
         if result.xpath('./p[@class="desc"]'):
-            content = escape(result.xpath('./p[@class="desc"]')[0].text_content())
+            content = escape(result.xpath('./p[@class="desc"]')[0]
+                             .text_content())
         else:
             content = ''