Fix for deleting from ManyArray - #3054
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you can just return RSVP.resolve() as deletion doesn't usually return data
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Basically, if you delete the final object from a ManyArray elsewhere the following will happen:
objectAt(0)will still return a value.The issue appears to be that the
currentStateis correctly empty, but thecanonicalStatestill retains the deleted item. BecauseobjectAthas a fallback, we incorrectly use the value from thecanonicalState.