Check if '@context' is present in JSON-LD to avoid crash

youtube_dl/extractor/common.py

@@ -1025,7 +1025,7 @@ class InfoExtractor(object):
             })
 
         for e in json_ld:
-            if re.match(r'^https?://schema.org/?$', e.get('@context')):
+            if '@context' in e and re.match(r'^https?://schema.org/?$', e.get('@context')):
                 item_type = e.get('@type')
                 if expected_type is not None and expected_type != item_type:
                     return info