pulp-container registry handler changes

$ git diff
diff --git a/pulp_container/app/registry.py b/pulp_container/app/registry.py
index 5b8d8cc..77cacdc 100644
--- a/pulp_container/app/registry.py
+++ b/pulp_container/app/registry.py
@@ -140,7 +140,14 @@ class Registry(Handler):
                 "Content-Type": return_media_type,
                 "Docker-Content-Digest": tag.tagged_manifest.digest,
             }
-            return await Registry.dispatch_tag(tag, response_headers)
+
+            try:
+                artifact = tag.tagged_manifest._artifacts.get()
+            except ObjectDoesNotExist:
+                ca = tag.tagged_manifest.contentartifact_set.all()[0]
+                return await self._stream_content_artifact(request, web.StreamResponse(), ca)
+            else:
+                return await Registry._dispatch(artifact.file, response_headers)
 
         # convert if necessary
         return await Registry.dispatch_converted_schema(tag, accepted_media_types, path)
[ipanova@fluffy pulp_container]$