[BUGFIX beta] Update DS.Errors#unknownProperty to return undefined
.
#5340
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In Ember 3.1+ any object that has an
unknownProperty
will throw an error if itsunknownProperty
returns any value other thanundefined
and the property is accessed viaobj.someProperty
(instead ofobj.get('someProperty')
orEmber.get(obj, 'someProperty')
).