message: Raise exception if long or lat not set in mapbox viz
diff: @@ -1982,6 +1982,8 @@ class MapboxViz(BaseViz):
  label_col = fd.get('mapbox_label')
  if not fd.get('groupby'):
  + if fd.get('all_columns_x') is None or fd.get('all_columns_y') is None:
  + raise Exception(_('[Longitude] and [Latitude] must be set'))
  d['columns'] = [fd.get('all_columns_x'), fd.get('all_columns_y')]
  if label_col and len(label_col) >= 1:
  