update: demo/wlan演示http的代码,若服务器返回的数据没有body,会报错

demo/wlan/esp32c3/hello_world/main.lua

@@ -36,7 +36,7 @@ sys.taskInit(function()
         -- local url = "http://ip.nutz.cn/json"
         local url = "http://nutzam.com/1.txt"
         local code, headers, body = http.request("GET", url).wait()
-        log.info("http", code, json.encode(headers), #body)
+        log.info("http", code, json.encode(headers or {}), body and #body or 0)
     else
         print("wlan NOT ready!!!!")
     end