get object status return empty

[martinou]

Describe the bug
apis/v1/status/objects/server-demo return {}

To Reproduce
Steps to reproduce the behavior:

1. Execute '...'
2. Send a request to 'apis/v1/status/objects/server-demo'
3. See error
   easegress return {}

Expected behavior
return object status

Version
1.4.0

Configuration

• Easegress Configuration

• HTTP server configuration

caCertBase64: ""
cacheSize: 0
certBase64: ""
certs: {}
http3: false
https: false
keepAlive: true
keepAliveTimeout: 60s
keyBase64: ""
keys: {}
kind: HTTPServer
maxConnections: 10240
name: server-demo
port: 6080
rules:
- host: ""
  hostRegexp: ""
  paths:
  - backend: pipeline-demo
    headers: []
    pathPrefix: /
    rewriteTarget: ""
tracing: null
xForwardedFor: false

• Pipeline Configuration

Logs

Easegress logs, if applicable.

OS and Hardware

• OS: centos 7.x
• CPU:Intel(R) Core(TM) i5-8265U
• Memory: 32GB

Additional context
postman invoke request apis/v1/status/objects/server-demo

invoke apis/v1/status/objects/ return is ok