az datafactory pipeline list issue

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

## Describe the bug

**Command Name**
`az datafactory pipeline list
Extension Name: datafactory. Version: 0.2.0.`

**Errors:**
```
Cannot deserialize as [object] an object of type
Traceback (most recent call last):
Temp\pip-unpacked-wheel-lhx4371t\knack\cli.py, ln 215, in invoke
cli\core\commands\__init__.py, ln 654, in execute
cli\core\commands\__init__.py, ln 718, in _run_jobs_serially
cli\core\commands\__init__.py, ln 711, in _run_job
Local\Temp\pip-unpacked-wheel-7avbl0u7\six.py, ln 703, in reraise
cli\core\commands\__init__.py, ln 701, in _run_job
...
Temp\pip-unpacked-wheel-laos76cl\msrest\serialization.py, ln 1586, in deserialize_data
Temp\pip-unpacked-wheel-laos76cl\msrest\serialization.py, ln 1615, in deserialize_iter
msrest.exceptions.DeserializationError: Cannot deserialize as [object] an object of type
```

## 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 datafactory pipeline list --resource-group {} --factory-name {}`

## Expected Behavior

## Environment Summary
```
Windows-10-10.0.19041-SP0
Python 3.6.8
Installer: MSI

azure-cli 2.13.0 *

Extensions:
datafactory 0.2.0

```
## Additional Context