Fix error on enabled insecure mode

Author: stevepartridge

service.go

@@ -124,15 +124,20 @@ func (s *Service) Serve() error {
 		panic(err)
 	}
 
+	tlsConfig := tls.Config{
+		NextProtos:         []string{"h2"},
+		InsecureSkipVerify: s.enableInsecure,
+	}
+
 	cert, err := s.GetCertificate()
 	if err != nil {
-		return err
+		if !s.enableInsecure {
+			return err
+		}
 	}
 
-	tlsConfig := tls.Config{
-		Certificates:       []tls.Certificate{cert},
-		NextProtos:         []string{"h2"},
-		InsecureSkipVerify: s.enableInsecure,
+	if !s.enableInsecure {
+		tlsConfig.Certificates = []tls.Certificate{cert}
 	}
 
 	tlsConfig.BuildNameToCertificate()