Merge branch 'performance-schema' of ssh://github.com/mozilla/treeherder-service into performance-schema

treeherder/webapp/api/artifact.py

@@ -64,7 +64,10 @@ class ArtifactViewSet(viewsets.ViewSet):
                         datum['name'],
                     ))
 
+        if artifact_data:
             jm.store_job_artifact(artifact_data)
+
+        if job_id_list and performance_artifact_data:
             jm.store_performance_artifact(
                 job_id_list, performance_artifact_data)