Sass: Spaces at EOF throw error

[tonyganch]

From csscomb/csscomb.js#243

combing (without any config file):

body
  background-color: red
  color: white
  float: left
  width: 100%
  padding: 4em

(on the last line are only two spaces.)

throws:

stack:  Error: Parsing error at test/_test-partial1.sass: Cannot read property 'type' of undefined
    at cssToAST (/usr/local/lib/node_modules/csscomb/lib/csscomb.js:464:19)
    at processString (/usr/local/lib/node_modules/csscomb/lib/csscomb.js:351:20)
    at /usr/local/lib/node_modules/csscomb/lib/csscomb.js:323:39
    at Array.0 (/usr/local/lib/node_modules/csscomb/node_modules/vow/lib/vow.js:555:56)
    at Object.callFns [as _onImmediate] (/usr/local/lib/node_modules/csscomb/node_modules/vow/lib/vow.js:1148:35)
    at processImmediate [as _immediateCallback] (timers.js:336:15)

[tonyganch]

Fixed in dev