firewall-cmd --set-description command fails.

Issue

• firewall-cmd --permanent --set-description= command fails with an error message.

Error: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/firewall/client.py", line 53, in handle_exceptions
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/firewall/client.py", line 441, in update
    self.fw_zone.update(tuple(settings.settings))
AttributeError: 'FirewallClientConfigZone' object has no attribute 'settings'

• firewall-cmd --permanent --ipset="set-name" --set-description= sets the description to the default zone instead of ipset.