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SDK - Improve errors when ContainerOp.output is unavailable

ContainerOp.output is only available when there is only one output.
Right now, when there are multiple outputs it just holds `None` instead of the a task output reference.
In this case however it's indistinguishable from just passing None argument.
This PR gives a quick fix to make accessing the nonexistent `.output` a compile-time error.

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