[BugBash][CLI]no response in client event command

### Describe the bug
[CLI]no response in client event command. Either Success or Failure should be returned. Or any other output which helps debug needs to be returned. However it shows nothing. I don't know what happened.

### To Reproduce

- Open Cloud Shell on Azure Portal
- Create a Web PubSub resource using `az webpubsub create ...`
- Start the client: `az webpubsub client start --hub-name -g -n `
- Send event to event handler: `event name message`
- Nothing happens.

### Exceptions (if any)

- Should return one of the following: success, failure, error etc with helpful debug info in case of failure/error.
- Better to have some way to set log/output level.

### Further technical details
- SDK and its version you use