FIX: make sure declared but empty streams report 0 length #1593
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Description
If the stream is declared (via pre-declare) but never populated report that it has 0 events in the stop documents (rather than just memory-holing it and not including an entry).
Motivation and Context
If there is a descriptor doc it should show up in the list of streams in the stop document.
How Has This Been Tested?
Added test (and manually tested).