token_response nil issue

panic: interface conversion: interface {} is nil, not string

goroutine 1 [running]:
remoteMonitor/thirdpart.get_token({0x2b03ab?, 0x8?}, {0x2b2511?, 0x3?})
	/root/remoteMonitor/thirdpart/WeChat.go:53 +0x1c8
remoteMonitor/thirdpart.SendWechat({0x40000d0000, 0x91})
	/root/remoteMonitor/thirdpart/WeChat.go:101 +0x5c
main.main()
	/root/remoteMonitor/main.go:25 +0x19c

README.MD

@@ -15,9 +15,23 @@ rm -rf /usr/bin/rtm
 mv rtm /usr/bin/
 rtm
 ```
+## build amd64 oracle
+```bash
+cd /root
+rm -rf remoteMonitor
+git clone https://git.sre.ink/go/remoteMonitor.git
+cd remoteMonitor
+go get github.com/shirou/gopsutil/v3/cpu@v3.21.12
+go get github.com/shirou/gopsutil/v3/disk@v3.21.12
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on  go build -v -a -o rtm main.go
+chmod +x rtm
+rm -rf /usr/bin/rtm
+mv rtm /usr/bin/
+rtm
+```
 
 
-## build
+## build amd64 cn
 ```bash
 cd /root
 rm -rf remoteMonitor

thirdpart/WeChat.go

@@ -50,6 +50,9 @@ func get_token(corpid, app_secret string) string {
 		log.Println(err)
 	}
 	token_response := praser_json(string(resp_data))
+	if token_response == nil {
+		return ""
+	}
 	return token_response["access_token"].(string)
 }