Fix error when constructing DownstreamIssue exception

endpoints/api/secscan.py

@@ -59,7 +59,7 @@ class RepositoryImageSecurity(RepositoryParamResource):
       else:
         data = secscan_api.get_layer_data(repo_image, include_features=True)
     except APIRequestFailure as arf:
-      raise DownstreamIssue(arf.message)
+      raise DownstreamIssue({'message': arf.message})
 
     if data is None:
       raise NotFound()