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tor_cell: Reject empty DATA messages

Nick Mathewson requested to merge nickm/arti:empty_data into main

If we don't reject these, they are a way to inject an undetected traffic signal. (This is LOW severity, since we only accept DATA when a stream is open, since DATA messages are rate-limited, and since using length==1 is nearly as effective.)

Closes #1269 (closed).

This is TROVE-2024-001.

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