[bug][regression] infinite find record triggered from view

[vadim-p]

Failed record fetch, initiated from view (ex: record.relationship.relAttr in .hbs), will retry request infinite number of times.

Repo with example.
In example, in index route, there are infinite loop of request to /preset-filters/:id.
Same for belongsTo relationship type.

This issue occurs after this #5376 merge.
With ember-data@3.0.2 it breaks on first retry because of TypeError:

GET http://localhost:4200/preset-filters/1 404 (Not Found)
Uncaught TypeError: Cannot read property 'eachAttribute' of null 
    at new Snapshot (-private.js:5041)
    at InternalModel.createSnapshot (-private.js:6940)
    at _find (-private.js:8546)
    at Class._fetchRecord (-private.js:10378)
    at _fetchRecord (-private.js:10441)
    at Class._flushPendingFetchForType (-private.js:10539)
    at cb (ember-metal.js:5356)
    at OrderedSet.forEach (ember-metal.js:5169)
    at MapWithDefault.forEach (ember-metal.js:5364)
    at Class.flushAllPendingFetches (-private.js:10421)

ember-cli: 3.1.4
ember-source: 3.1.2
ember-data: 3.1.1

[runspired]

@vadim-p could you check if this is still an issue on master or at least on the latest 3.2 ? I suspect I fixed it already.

[vadim-p]

@runspired, unfortunately problem persists.

Ember      : 3.2.0
Ember Data : 3.3.0-canary