core: Simplify Server initializer

main.go

@@ -63,7 +63,7 @@ func main() {
 
 	// Start each server with its one or more configurations
 	for addr, configs := range addresses {
-		s, err := server.New(addr.String(), configs, configs[0].TLS.Enabled)
+		s, err := server.New(addr.String(), configs)
 		if err != nil {
 			log.Fatal(err)
 		}

server/server.go

@@ -29,7 +29,12 @@ type Server struct {
 // New creates a new Server which will bind to addr and serve
 // the sites/hosts configured in configs. This function does
 // not start serving.
-func New(addr string, configs []Config, tls bool) (*Server, error) {
+func New(addr string, configs []Config) (*Server, error) {
+	var tls bool
+	if len(configs) > 0 {
+		tls = configs[0].TLS.Enabled
+	}
+
 	s := &Server{
 		address: addr,
 		tls:     tls,