Description of problem:

Got a traceback when I didn't enter values for the networking configuration while running staypuft-installer.

Version-Release number of selected component (if applicable):
[root@staypuft ~]# rpm -q foreman-installer-staypuft
foreman-installer-staypuft-0.0.14-1.el6ost.noarch


How reproducible:
always

Steps to Reproduce:
1. run staypuft-installer
2. choose an interface
3. leave networking configuration blank
4. get a traceback

Actual results:
    [root@staypuft ~]# staypuft-installer
    Provisioning setup
     
    Please select NIC on which you want Foreman provisioning enabled:
    1. eth1
    2. eth0
    ?  1
     
    Current networking setup:
           Network interface: 'eth1'
                  IP address: ''
                Network mask: ''
             Network address: ''
            DHCP range start: ''
              DHCP range end: ''
                     Gateway: '192.168.122.1'
               DNS forwarder: '192.168.122.1'
                      Domain: 'localdomain'
                 Foreman URL: 'https://staypuft.localdomain'
    Set this host networking: ✓
     
    Is the networking correct?:
    1. Yes, move on!
    2. No, change Network interface
    3. No, change IP address
    4. No, change Network mask
    5. No, change Network address
    6. No, change DHCP range start
    7. No, change DHCP range end
    8. No, change Gateway
    9. No, change DNS forwarder
    10. No, change Domain
    11. No, change Foreman URL
    12. No, change Set this host networking
    13. No, cancel installation
    1
    /usr/share/foreman-installer/hooks/pre_validations/10-gather_and_set_staypuft_values.rb:13:in `load': private method `split' called for nil:NilClass (NoMethodError)
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/hook_context.rb:13:in `instance_exec'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/hook_context.rb:13:in `execute'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/hooking.rb:48:in `execute'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/hooking.rb:47:in `each_pair'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/hooking.rb:47:in `execute'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/kafo_configure.rb:92:in `execute'
            from /usr/lib/ruby/gems/1.8/gems/clamp-0.6.2/lib/clamp/command.rb:67:in `run'
            from /usr/lib/ruby/gems/1.8/gems/clamp-0.6.2/lib/clamp/command.rb:125:in `run'
            from /usr/lib/ruby/gems/1.8/gems/kafo-0.6.0/lib/kafo/kafo_configure.rb:116:in `run'
            from /usr/sbin/staypuft-installer:54


Expected results:
Error message telling me I didn't fill in some required fields. Or some indication the fields are required.

Additional info:
I honestly thought this was asking me to confirm the *existing* configuration, which was exactly right as shown. eth1 current was assigned no IP, etc.