Try different method of validating variables

Add missing if

Check variables properly

templates/home_server.erb

 home_server <%= @name %> {
 	type = <%= @type %>
-<% if @ipaddr != '' -%>
+<% if defined?(@ipaddr) -%>
 	ipaddr = <%= @ipaddr %>
 <% end -%>
-<% if @ipv6addr != '' -%>
+<% if defined?(@ipv6addr) -%>
 	ipv6addr = <%= @ipv6addr %>
 <% end -%>
-<% if @virtual_server != '' -%>
+<% if defined?(@virtual_server) -%>
 	virtual_server = <%= @virtual_server %>
 <% end -%>
 	port = <%= @port %>

templates/home_server_pool.erb

 home_server_pool <%= @name %> {
 	type = <%= @type %>
-<% if @virtual_server != '' -%>
+<% if defined?(@virtual_server) -%>
 	virtual_server = <%= @virtual_server %>
 <% end -%>
 <% @home_server.each do |server| -%>
 	home_server = <%= server %>
 <% end -%>
-<% if @fallback != '' -%>
+<% if defined?(@fallback) -%>
 	fallback = <%= @fallback %>
 <% end -%>
 }

templates/realm.erb

 realm <%= @name %> {
-<% if @virtual_server != '' -%>
+<% if defined?(@virtual_server) -%>
 	virtual_server = <%= @virtual_server %>
 <% end -%>
-<% if @auth_pool != '' -%>
+<% if defined?(@auth_pool) -%>
 	auth_pool = <%= @auth_pool %>
 <% end -%>
-<% if @acct_pool != '' -%>
+<% if defined?(@acct_pool) -%>
 	acct_pool = <%= @acct_pool %>
 <% end -%>
-<% if @pool != '' -%>
+<% if defined?(@pool) -%>
 	pool = <%= @pool %>
 <% end %>
 <% if @nostrip -%>