title: Return Blank from Python flask API
body: <p>I have an API that must return just blank and status as 200 OK in case there is no data available</p>
  
  <p>I have tried following things and facing these error</p>
  
  <pre><code>if df.empty:
     return '' , 200
  </code></pre>
  
  <p>This returns "" in the browser</p>
  
  <pre><code>if df.empty:
     return json.loads('{}'), 200
  </code></pre>
  
  <p>This return {} in the browser</p>
  
  <p>Send status as 204 (NO CONTENT) makes the previous content to be as it is on the browser</p>
  
  <p>How can i return complete blank with status as 200? </p>