message: fix for annotation layer bug
diff: @@ -279,7 +279,7 @@ export default class AnnotationLayer extends React.PureComponent {
  description = `Use a pre defined Superset Chart as a source for annotations and overlays.
  'your chart must be one of these visualization types:
  '[${getSupportedSourceTypes(annotationType)
  - .map(x => vizTypes[x].label).join(', ')}]'`;
  + .map(x => ((x in vizTypes && 'label' in vizTypes[x]) ? vizTypes[x].label : '')).join(', ')}]'`;
  }
  } else if (annotationType === AnnotationTypes.FORMULA) {
  label = t('Formula');
  