message: Only renders navigation if needed
diff: @@ -72,6 +72,7 @@ export default class ModalBlockLightbox extends PureComponent {
  return (
  <BlockLightbox block={block} context="MODAL">
  + {ids.length > 1 &&
  <ModalBlockLightboxNavigation
  id={id}
  ids={ids}
  @@ -82,6 +83,7 @@ export default class ModalBlockLightbox extends PureComponent {
  zIndex="1"
  onChange={this.updateId}
  />
  + }
  </BlockLightbox>
  );
  }}
  