autogen-ext: improve import error messages for model clients #7151
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Add user-friendly ImportError messages when optional dependencies are not installed for Ollama, Anthropic, and OpenAI model clients. This follows the pattern already used by LlamaCppChatCompletionClient, providing clear guidance on how to install the required dependencies (e.g., "pip install autogen-ext[ollama]"). 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: majiayu000 <1835304752@qq.com>
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Summary
Why are these changes needed?
When users try to use model clients without the required optional dependencies installed, they receive raw
ImportError/ModuleNotFoundErrorexceptions that don't provide guidance on how to fix the issue.This change wraps imports in try/except blocks to provide clear, actionable error messages like:
Related issue number
Closes #4605
Checks
🤖 Generated with Claude Code