$count aggregation stage does return nothing when count is zero

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      I was using the aggregation stage $count and noticed that if the input dataset was empty that $count does not return anything.

      I was expecting it to return 0.

      There is nothing specified in the docs to expect this behaviour.
      https://www.mongodb.com/docs/manual/reference/operator/aggregation/count/

            Assignee:
            [DO NOT USE] Backlog - Query Optimization
            Reporter:
            Daniel Müller
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