code: def get_screen():
      
      img_title = 'screen_' + g.client_id + '.png'
      image_path = STATIC_FILES_PATH + img_title
      if g.driver_status != WhatsAPIDriverStatus.LoggedIn:
          try:
              g.driver.get_qr(image_path)
              return send_file(image_path, mimetype='image/png')
          except Exception as err:
              pass
      g.driver.screenshot(image_path)
      return send_file(image_path, mimetype='image/png')
docs: Capture chrome screen image and send it back. If the screen is currently 
      at qr scanning phase, return the image of qr only, else return image of full
      screen