[Bug][Manager] The ext_params is incorrectly set to null

[fuweng11]

What happened

ext params is incorrectly set to null.

What you expected to happen

ext params is incorrectly not set to null when update.

How to reproduce

1.Adding tenant to a group.
The request parameters are as follows:

result:
Tenant successfully saved。

2.Update group without tenant.
The request parameters are as follows:

result:
Tenant is incorrectly set to null.

Environment

No response

InLong version

master

InLong Component

InLong Manager

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct