Fixes nil pointer dereferencing for Consul TLS transport

registry/consul_registry.go

@@ -81,6 +81,9 @@ func newConsulRegistry(opts ...Option) Registry {
 	if options.Secure || options.TLSConfig != nil {
 		config.Scheme = "https"
 		// We're going to support InsecureSkipVerify
+		if config.HttpClient == nil {
+			config.HttpClient = new(http.Client)
+		}
 		config.HttpClient.Transport = newTransport(options.TLSConfig)
 	}