Removed comment

Vagrant only requires an ip **if** `type` is set **and** is not `dhcp`. The
only other type, currently, is `nfs`. Obviously nfs requires an IP so under
that circumstance or if `type` is set to anything but dhcp, vagrant will
error if an ip is not assigned.

If `type` is `nil`, it is deleted from the hash.

lib/vagrant-libvirt/action/create_networks.rb

@@ -63,9 +63,6 @@ module VagrantPlugins
 
               if @options[:ip]
                 handle_ip_option(env)
-              # in vagrant 1.2.3 and later it is not possible to take this branch
-              # because cannot have name without ip
-              # https://github.com/mitchellh/vagrant/commit/cf2f6da4dbcb4f57c9cdb3b94dcd0bba62c5f5fd
               elsif @options[:network_name]
                 handle_network_name_option(env)
               end