Describe the bug
The information of default namespace for getting all namespaces is:
namespaceShowName: "public"
namespaceDesc: null

The information of default namespace for get a namespace is:
namespaceShowName: "Public"
namespaceDesc: "Public Namespace"

Expected behavior
Keep the same information for default namespace

Actually behavior
Keep the same information for default namespace

How to Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See errors

Desktop (please complete the following information):

• OS: mac
• Version nacos-server 1.3.2
• Module naming
• SDK

Additional context