fix log_function_use warning

[Hk669]

Why are these changes needed?

affected the complete groupchat of the AutoGen, showing the warning to [runtime_logging] log_function_use: autogen logger is None

Related issue number

Closes #2911

Screenshots

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[thinkall]

LGTM! Thanks.

[sonichi]

@colombod could you take a look at the failing tests of llama-index? https://github.com/microsoft/autogen/actions/runs/9656849470/job/26635080470?pr=3018
This PR doesn't change anything related to it.

[marklysze]

Testing looked good, thanks!

[Hk669]

@colombod could you take a look at the failing tests of llama-index? https://github.com/microsoft/autogen/actions/runs/9656849470/job/26635080470?pr=3018
This PR doesn't change anything related to it.

@sonichi, is anyone working on this issue?

[colombod]

@colombod could you take a look at the failing tests of llama-index? https://github.com/microsoft/autogen/actions/runs/9656849470/job/26635080470?pr=3018
This PR doesn't change anything related to it.

@sonichi, is anyone working on this issue?

That is pretty awkward, it seems that llamaindex is not installed before running the test. but in this pr i don't see any changes to the environments

[Hk669]

@colombod could you take a look at the failing tests of llama-index? https://github.com/microsoft/autogen/actions/runs/9656849470/job/26635080470?pr=3018
This PR doesn't change anything related to it.

@sonichi, is anyone working on this issue?

That is pretty awkward, it seems that llamaindex is not installed before running the test. but in this pr i don't see any changes to the environments

This PR is not related to it. Please make a new PR for the llamaindex tests failure @colombod . Thanks