class Kramdown::Converter::Html

def convert_td(el, indent)
  res = inner(el, indent)
  type = (@stack[-2].type == :thead ? :th : :td)
  "#{' '*indent}<#{type}#{html_attributes(el.attr)}>#{res.empty? ? entity_to_str(ENTITY_NBSP) : res}</#{type}>\n"
end