Crash when resource does not define method in RAML

[cybertk]

Given a raml which contains resource /root has not defined method section,

#%RAML 0.8

title: World Music API
baseUri: http://example.api.com/{version}
version: v1

/root:
  /machines:
    get:
      responses:
        200:
          body:
            application/json:
              schema: |
                [
                  type: 'string'
                  name: 'string'
                ]
              example: |
                { "type": "Kulu", "name": "Mike" }

Abao crashed with

/Users/quanlong/projects/abao/node_modules/async/lib/async.js:120
        if (!arr.length) {
                ^
TypeError: Cannot read property 'length' of undefined
  at Object.async.each (/Users/quanlong/projects/abao/node_modules/async/lib/async.js:120:17)
  at /Users/quanlong/projects/abao/lib/add-tests.js:33:20
  at /Users/quanlong/projects/abao/node_modules/async/lib/async.js:125:13
  at Array.forEach (native)
  at _each (/Users/quanlong/projects/abao/node_modules/async/lib/async.js:46:24)
  at Object.async.each (/Users/quanlong/projects/abao/node_modules/async/lib/async.js:124:9)
  at addTests (/Users/quanlong/projects/abao/lib/add-tests.js:18:18)
  at /Users/quanlong/projects/abao/lib/abao.js:40:18
  at fn (/Users/quanlong/projects/abao/node_modules/async/lib/async.js:641:34)
  at Object._onImmediate (/Users/quanlong/projects/abao/node_modules/async/lib/async.js:557:34)
  at processImmediate [as _immediateCallback] (timers.js:345:15)