优化${serverName}识别相关代码

internal/nodes/listener_http.go

@@ -172,14 +172,11 @@ func (this *HTTPListener) ServeHTTPWithAddr(rawWriter http.ResponseWriter, rawRe
 
 	server, serverName := this.findNamedServer(domain, false)
 	if server == nil {
-		if server == nil {
-			// 增加默认的一个服务
-			server = this.emptyServer()
-		} else {
-			serverName = domain
-		}
+		server = this.emptyServer()
 	} else if !server.CNameAsDomain && server.CNameDomain == domain {
 		server = this.emptyServer()
+	} else {
+		serverName = domain
 	}
 
 	// 绑定连接