Cannot run .md file in jupyter: None not found.

[grst]

Editing and running markdown files is a great idea! Unfortunately for me it did not work out. When opening a markdown file in jupyter notebook a red box appears next to the 'Kernel' which says None not found. I am unable to manually restart or choose a different kernel.

Steps to reproduce:

1. I adjusted the configuration file as described to be able to open .md files in jupyter notebook. This works well.

2. I created a minimal test.md with the following content:

   ```{.python .input}              
   print('Hello World') 
   \``` 
   

(sorry, don't know how to escape the fences properly...)

3. I open this file in jupyter notebook (v4.2.1 on Anaconda python 3.5.2)