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Test: Missing subscription field should not be an "internal error"

A remaining issue with subscriptions is attempting to subscribe to a missing field. The existing implementation creates an internal error which is an improper blame since there is no possibility to fix it internally - it is an issue with the query.

For consistency with the same scenario for query/mutation operations, this simply returns nothing. I interpret the equivalent of "undefined" for a subscribe operation as an empty iteration.

Note: this will require spec changes, however spec changes are necessary either way to resolve the ambiguity of this exact scenario.

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