message: [viz] Fix payload force logic
diff: @@ -244,7 +244,6 @@ class BaseViz(object):
  """Handles caching around the json payload retrieval"""
  cache_key = self.cache_key
  payload = None
  - force = force if force else self.form_data.get('force') == 'true'
  if not force and cache:
  payload = cache.get(cache_key)
  