Continued restructing.

IPAddressList.cpp

@@ -17,7 +17,7 @@ namespace core {
    }
    
    bool IPAddressList::contains(std::string ipAddress) {
-      return list.find(ipAddress) != list.end();
+      return list.size() > 0 ? list.find(ipAddress) != list.end(): false;
    }
 
 }