Description of problem:
In TUI go to Network spoke and set-up address, netmask, gateway for IPv4. I used invalid values. When I went back by 'c'ontinue I got this exception.

My use-case:
address 10.1.1.1
netmask 1.2.3.4
gateway 2.3.4.5

Version-Release number of selected component:
anaconda-21.48.22.63-1

The following was filed automatically by anaconda:
anaconda 21.48.22.63-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/pyanaconda/nm.py", line 1002, in _update_settings
    None)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/nm.py", line 962, in nm_update_settings_of_device
    return _update_settings(settings_path, new_values)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/network.py", line 452, in update_settings_with_ksdata
    nm.nm_update_settings_of_device(devname, new_values)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/tui/spokes/network.py", line 229, in input
    network.update_settings_with_ksdata(devname, ndata)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/tui/simpleline/base.py", line 441, in input
    key = self._screens[-1][0].input(args, key)
Error: g-io-error-quark: GDBus.Error:org.freedesktop.NetworkManager.Settings.Connection.MissingProperty: ipv4.addresses: this property cannot be empty for 'method=manual' (36)

Additional info:
addons:         org_fedora_oscap, com_redhat_kdump
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   initrd=/test/rhel7/initrd.img resolution=1024x768 nokill inst.repo=http://cobra02/trees/rhel7 inst.text BOOT_IMAGE=/test/rhel7/vmlinuz 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.10.0-373.el7.x86_64
product:        Red Hat Enterprise Linux 7
release:        Red Hat Enterprise Linux Client release 7.3 Beta (Maipo)
release_type:   pre-release
type:           anaconda
uid:            0
version:        7.3