piping output to other programs ('less' here) causes a "broken pipe" error

### **This is autogenerated. Please review and update as needed.**
## Describe the bug

**Command Name**
`az vm boot-diagnostics get-boot-log`

**Errors:**
```
The command failed with an unexpected error. Here is the traceback:
[Errno 32] Broken pipe
Traceback (most recent call last):
File "/opt/az/lib/python3.6/site-packages/knack/cli.py", line 231, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 657, in execute
raise ex
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 720, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 691, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 328, in __call__
return self.handler(*args, **kwargs)
File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
return op(**command_args)
File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/vm/custom.py", line 1645, in get_boot_log
storage_client.get_blob_to_stream(container, blob, BootLogStreamWriter(sys.stdout), max_connections=1)
File "/opt/az/lib/python3.6/site-packages/azure/multiapi/storage/v2018_11_09/blob/baseblobservice.py", line 2166, in get_blob_to_stream
stream.write(blob.content)
File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/vm/custom.py", line 1579, in write
self.out.write(content)
BrokenPipeError: [Errno 32] Broken pipe

```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az vm boot-diagnostics get-boot-log -n {} | less`
- the first screenfull of the serial console will be displayed.
- Now quit less WITHOUT going to end-of-log.
- broken pipe

## Expected Behavior

closing the pipe by ending the program should not result in a backtrace.

## Environment Summary
```
Linux-5.10.16.3-microsoft-standard-WSL2-x86_64-with-debian-bullseye-sid
Python 3.6.10
Installer: DEB

azure-cli 2.27.1

Extensions:
vm-repair 0.3.6
ssh 0.1.5

```
## Additional Context