Fix Micro Proxy nil Transport Bug (#1208)

server/options.go

@@ -214,6 +214,13 @@ func TLSConfig(t *tls.Config) Option {
 	return func(o *Options) {
 		// set the internal tls
 		o.TLSConfig = t
+
+		// set the default transport if one is not
+		// already set. Required for Init call below.
+		if o.Transport == nil {
+			o.Transport = transport.DefaultTransport
+		}
+
 		// set the transport tls
 		o.Transport.Init(
 			transport.Secure(true),