example broken notebook/slide render

example.ipynb

{
 "metadata": {
  "celltoolbar": "Slideshow",
  "name": "",
  "signature": "sha256:6157f722e4d6b31eb0d27a030fed5e48c5e801931ff55070f0db81d40efb4332"
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "```shell\n",
      "echo \"this is a test\"\n",
      "```\n",
      "\n"
     ]
    }
   ],
   "metadata": {}
  }
 ]
}