text: Title: Flasgger execution is a success but not showing the output XML body 
  Body: So i am trying to deploy an IRIS Model through flasgger , but when i hit the execute button under the API DOC GUI, i do not see any output , where am expecting an XML output. Although i can see the HTTP/200 OK successful response in my ipython notebook.  So i am trying to understand what am i doing here . Can somebody please assist me on this problem, i am stuck for almost a month now. Any suggestion would be deeply appreciated !
  <img width="783" alt="flasgger_APIDOCS" src="https://user-images.githubusercontent.com/42491841/73424366-a3a47780-4354-11ea-8e8f-85da7da55d0c.PNG">
  