message: Fix checkbox is fails When disable Druid datasource
diff: @@ -1449,10 +1449,8 @@ class Superset(BaseSupersetView):
  def checkbox(self, model_view, id_, attr, value):
  """endpoint for checking/unchecking any boolean in a sqla model"""
  modelview_to_model = {
  - 'TableColumnInlineView':
  - ConnectorRegistry.sources['table'].column_class,
  - 'DruidColumnInlineView':
  - ConnectorRegistry.sources['druid'].column_class,
  + '{}ColumnInlineView'.format(name.capitalize()): source.column_class
  + for name, source in ConnectorRegistry.sources.items()
  }
  model = modelview_to_model[model_view]
  col = db.session.query(model).filter_by(id=id_).first()
  