Ensure no avatar information is passed to Deep Chat if empty

I tested this locally and it works. Also in combination with https://www.drupal.org/project/ai/issues/3509363#comment-16018217 ✨ Allow other modules to provide styles for Deep Chat Active

Uploading the patch also to use in composer based projects.

Previous patch was corrupted, sorry.

Thanks, getting merged.

Automatically closed - issue fixed for 2 weeks with no activity.

We are doing some issue management housekeeping and adding/removing components.

We are removing the "Other Submodules" component and want people to categorize issues with the best module/submodule component.

Moving this issue to "AI Chatbot".

See 📌 Update AI module project components Active for more details.