Error: Az stream-analytics output test

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Related command

### Extension name (the extension in question)
Az stream-analytics

### Description of issue (in as much detail as possible)
When I run 'az stream-analytics output test --job-name "myjob" --name "Output" --resource-group "myrg" ' command.
The following error is output.

(BadRequest) The JSON provided in the request body is invalid. Required property 'properties' not found in JSON. Path '', line 1, position 2.
Code: BadRequest
Message: The JSON provided in the request body is invalid. Required property 'properties' not found in JSON. Path '', line 1, position 2.

I tried to rerun it multiple times, and they all output the same.
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