"'NoneType' object is not iterable" on "az advisor recommendation disable"

[Dessix]

This is autogenerated. Please review and update as needed.

Describe the bug

Command Name
az advisor recommendation disable

Errors:

'NoneType' object is not iterable
Traceback (most recent call last):
Temp\pip-install-p8t_6awn\knack\knack\cli.py, ln 206, in invoke
azure\cli\core\commands\__init__.py, ln 603, in execute
azure\cli\core\commands\__init__.py, ln 661, in _run_jobs_serially
azure\cli\core\commands\__init__.py, ln 654, in _run_job
Local\Temp\pip-install-p8t_6awn\six\six.py, ln 693, in reraise
azure\cli\core\commands\__init__.py, ln 631, in _run_job
azure\cli\core\commands\__init__.py, ln 306, in __call__
azure-cli-core\azure\cli\core\__init__.py, ln 485, in default_command_handler
azure\cli\command_modules\advisor\custom.py, ln 26, in disable_recommendations
TypeError: 'NoneType' object is not iterable

To Reproduce:

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

• az login
• az advisor recommendation disable

Expected Behavior

Environment Summary

Windows-10-10.0.17763-SP0
Python 3.6.6
Shell: powershell.exe

azure-cli 2.0.75

Additional Context

[yonzhan]

@RakeshMohanMSFT Nice PR to fix.