Description of problem:
The firewall-cmd --set-description command fails with an error message.

Version-Release number of selected component (if applicable):
firewalld-0.4.3.2-8.1.el7_3.noarch

How reproducible: 
Always

Steps to Reproduce:
1. Add an ipset: firewall-cmd --permanent --new-ipset=geoblock --type=hash:net
2. Run firewall-cmd --permanent --ipset=geoblock --set-description="Geoblock ipset"

Actual results:
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'

Expected results:
No errors

Additional info:
The description seems to be saved in /etc/firewalld/zones/public.xml:

<?xml version="1.0" encoding="utf-8"?>
<zone>
  <short>Geoblock ipset</short>
  <description>Geoblock ipset</description>
  <service name="dhcpv6-client"/>
  <service name="ssh"/>
  <port protocol="tcp" port="2049"/>
  <port protocol="udp" port="2049"/>
</zone>

and the --get-description shows this:

# firewall-cmd --permanent --ipset=geoblock --get-description
Geoblock ipset