Fix a broken reference in models/node.js

[abrinckm]

Hi,

I had a problem calling node.save(); which resulted in this error:

TypeError: Cannot read property 'get' of undefined
    at node.js:140
    at Array.filter (<anonymous>)
    at Class.save (node.js:139)
    at Class.superWrapper [as save] (ember.debug.js:45374)

I found the culprit in addons/models/node.js
Within the line

contributors.members.list.filter(m => !m.record.get('isNew') ...

Where record was not found in m. However, I did find that m contained _record.

So my solution was to just change all references of m.record to m._record and this fixed the issue for me. Not entirely sure if this is a correct solution though.

[jamescdavis]

This was recently fixed in #272, which was included in Ember OSF 0.12.0 and published to NPM.

The best way to fix this is to use m.getRecord() as _record is an internal property.