Serialize failures

models/workflow_execution/workflow_execution.go

@@ -78,6 +78,6 @@ func (dma *WorkflowExecution) Serialize() map[string]interface{} {
 	if err != nil {
 		return nil
 	}
-	json.Unmarshal(b, dma)
+	json.Unmarshal(b, &m)
 	return m
 }