Describe the bug

This issue was reported to me by a Discord user; I have not experienced it myself.

When using goose with an exhausted GitHub Copilot account, goose returns empty messages instead of an error explaining that you're out of chat requests on your GitHub Copilot account.

Here are two screenshots that the Discord user experiencing the issue sent me:

To Reproduce

Yeah have fun reproducing this 🤣
Step 1. Exhaust your GitHub Copilot account...
Step 2. Send a message to goose using the GitHub Copilot provider.
Step 3. Observe the empty message you receive as a response, and wonder why goose isn't telling you anything.

Expected behavior

When I'm out of chat requests on my GitHub Copilot plan, goose should tell me that (as an error) instead of responding with an empty message.

Please provide the following information

• OS & Arch: Kubuntu 25.10
• Interface: CLI
• Version: v1.19.1
• Extensions enabled: computercontroller, todo, skills, extensionmanager, developer, code_execution, chatrecall
• Provider & Model: GitHub Copilot – gpt-4.1