Empty code blocks are erroring

[d0c-s4vage]

lookatme test.md
Traceback (most recent call last):
  File "/home/james/__ws__/dev/lookatme/venv3/bin/lookatme", line 11, in <module>
    load_entry_point('lookatme', 'console_scripts', 'lookatme')()
  File "/home/james/__ws__/dev/lookatme/venv3/lib/python3.6/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/home/james/__ws__/dev/lookatme/venv3/lib/python3.6/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/james/__ws__/dev/lookatme/venv3/lib/python3.6/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/james/__ws__/dev/lookatme/venv3/lib/python3.6/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/james/__ws__/dev/lookatme/lookatme/__main__.py", line 74, in main
    pres.run()
  File "/home/james/__ws__/dev/lookatme/lookatme/pres.py", line 89, in run
    self.tui = lookatme.tui.create_tui(self, start_slide=start_slide)
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 273, in create_tui
    tui = MarkdownTui(pres, palette, start_slide)
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 162, in __init__
    self.prep_pres(self.pres, start_idx)
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 175, in prep_pres
    self.update()
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 216, in update
    self.update_body()
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 207, in update_body
    rendered = self.slide_renderer.render_slide(self.curr_slide)
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 70, in render_slide
    raise res
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 100, in run
    res = self._do_render(to_render, slide_num)
  File "/home/james/__ws__/dev/lookatme/lookatme/tui.py", line 123, in _do_render
    res = render_token(token, stack[-1], stack, self.loop)
  File "/home/james/__ws__/dev/lookatme/lookatme/contrib/__init__.py", line 66, in inner
    return fn(*args, **kwargs)
  File "/home/james/__ws__/dev/lookatme/lookatme/render/markdown_block.py", line 209, in render_code
    res = pygments_render.render_text(token["text"], lang=lang)
  File "/home/james/__ws__/dev/lookatme/lookatme/render/pygments.py", line 76, in render_text
    if markup[-1][1].endswith("\n"):
IndexError: list index out of range