Cautiously grab the content digest.

common/djangoapps/contentserver/middleware.py

@@ -67,13 +67,13 @@ class StaticContentServer(object):
             actual_digest = None
             try:
                 content = self.load_asset_from_location(loc)
-                actual_digest = content.content_digest
+                actual_digest = getattr(content, "content_digest", None)
             except (ItemNotFoundError, NotFoundError):
                 return HttpResponseNotFound()
 
             # If this was a versioned asset, and the digest doesn't match, redirect
             # them to the actual version.
-            if requested_digest is not None and (actual_digest != requested_digest):
+            if requested_digest is not None and actual_digest is not None and (actual_digest != requested_digest):
                 actual_asset_path = StaticContent.add_version_to_asset_path(asset_path, actual_digest)
                 return HttpResponsePermanentRedirect(actual_asset_path)
 

common/lib/xmodule/xmodule/contentstore/content.py

@@ -243,7 +243,7 @@ class StaticContent(object):
         try:
             content = AssetManager.find(asset_key, as_stream=True)
             serve_from_cdn = not getattr(content, "locked", True)
-            content_digest = content.content_digest
+            content_digest = getattr(content, "content_digest", None)
         except (ItemNotFoundError, NotFoundError):
             # If we can't find the item, just treat it as if it's locked.
             serve_from_cdn = False