public @NotNull List<@NotNull MarkdownTableCell> getCells() {
    MarkdownTableCell[] cells = PsiTreeUtil.getChildrenOfType(this, MarkdownTableCell.class);
    if (cells == null) {
      return ContainerUtil.emptyList();
    }
    return List.of(cells);
  }
public @NotNull List<@NotNull MarkdownTableCell> getCells()