Improved output.

src/main.cr

@@ -330,13 +330,19 @@ class WirelessAPSetup
 			str << "\t\tmtu #{mtu}\n" unless mtu.nil?
 
 			# ipv4
-			str << "\t\tinet #{@main_ip_v4}\n"
+			unless main_ip_v4.is_a?(NotSetup)
-			@aliasses_v4.each do |a|
+				str << "\t\tinet #{main_ip_v4}\n"
+			end
+
+			aliasses_v4.each do |a|
 				str << "\t\talias #{a}\n"
 			end
 
 			# ipv6
-			str << "\t\tinet6 #{@main_ip_v6}\n"
+			unless main_ip_v6.is_a?(NotSetup)
+				str << "\t\tinet6 #{main_ip_v6}\n"
+			end
+
 			unless @aliasses_v6.empty?
 				@aliasses_v6.each do |a|
 					str << "\t\talias6 #{a}\n"
@@ -417,7 +423,10 @@ class InterfaceConfiguration
 			end
 
 			# ipv4
-			str << "\tinet #{main_ip_v4}\n"
+			unless main_ip_v4.is_a?(NotSetup)
+				str << "\tinet #{main_ip_v4}\n"
+			end
+
 			unless aliasses_v4.empty?
 				aliasses_v4.each do |a|
 					str << "\talias #{a}\n"
@@ -425,25 +434,23 @@ class InterfaceConfiguration
 			end
 
 			# ipv6
-			str << "\tinet6 #{main_ip_v6}\n"
+			unless main_ip_v6.is_a?(NotSetup)
+				str << "\tinet6 #{main_ip_v6}\n"
+			end
+
 			unless aliasses_v6.empty?
 				aliasses_v6.each do |a|
 					str << "\talias6 #{a}\n"
 				end
 			end
 
-			if dns.empty?
+			unless dns.empty?
-				str << "\tno dns configured\n"
-			else
 				dns.each do |ip|
 					str << "\tdns: #{ip}\n"
 				end
 			end
 
-			if wireless_networks.empty?
+			unless wireless_networks.empty?
-				str << "\tno wireless connection configured\n" if wireless
-			else
-
 				# to improve readability
 				str << "\n"
 				wireless_networks.each do |k,v|