Uncaught TypeError: Cannot read property 'length' of undefined

Hi,
I really like this creation, it's very helpful when I writing Markdown.But I find some problem, if a cell not contains alphabet,i mean some chinese characters,will get a error in Atom.So I changed some code, and it is worked in my Atom. 
However I am a newcomer of CofeeScript, if you have better way to fix this error I wait in hope for your update. `: )` 
- A little bug
When a cell contains only analphabetic characters will get error of
length:
> Uncaught TypeError: Cannot read property 'length' of undefined

- Change Default alignment to Centre
  It just personal property.