guilds that have sub guilds can no longer be invited to join nations

src/engine/net/client/handlers/InviteToSubHandler.java

@@ -102,6 +102,9 @@ public class InviteToSubHandler extends AbstractClientMsgHandler {
         //source guild is limited to 7 subs
         //TODO this should be based on TOL rank
 
+        //cannot be subbed into a nation if you already have your own sub guilds
+        if(targetGuild.getSubGuildList() != null && targetGuild.getSubGuildList().size() > 0)
+            return true;
 
         if (!sourceGuild.canSubAGuild(targetGuild)) {
             sendChat(source, "This Guild can't be subbed.");