Merge branch 'fix-errors' into 'master'

fix erros reported on gitlab

Closes #89, #87, and #86

See merge request !133

searx/engines/youtube_noapi.py

@@ -47,6 +47,7 @@ def request(query, params):
     try:
         lang, region = params['language'].split('-')
     except:
+        lang = 'en'
         region = 'us'
     if not params['engine_data'].get('next_page_token'):
         params['url'] = search_url.format(query=quote_plus(query), page=params['pageno'], region=region, lang=lang)

searx/webapp.py

@@ -368,6 +368,9 @@ def proxify(url):
 
 def image_proxify(url):
 
+    if not isinstance(url, str):
+        return None
+
     if url.startswith('//'):
         url = 'https:' + url
 
@@ -1008,6 +1011,8 @@ def image_proxy():
             max_redirects=20)
 
         resp = next(stream)
+        if resp is None:
+            return '', 400
         content_length = resp.headers.get('Content-Length')
         if content_length and content_length.isdigit() and int(content_length) > maximum_size:
             return 'Max size', 400