Fix: catch requests.ConnectionError in list_repo_templates

[laitifranz]

What does this PR do?

This PR fixes a bug in the list_repo_templates function where network connectivity issues would cause the entire function to crash instead of gracefully falling back to local files.

Problem

When used without an internet connection, the function raised:

    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: (MaxRetryError("HTTPSConnectionPool(host='huggingface.co', port=443): Max retries exceeded with url: /api/models/Qwen/Qwen2.5-VL-7B-Instruct/tree/main/additional_chat_templates?recursive=False&expand=False (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x14cdd4b28b60>: Failed to establish a new connection: [Errno 101] Network is unreachable'))"), '(Request ID: ---)')

The exception handler only caught Python’s built-in ConnectionError, not the requests-specific one, so the fallback logic never ran.

Fix

Add requests.exceptions.ConnectionError to the exception handler.

Now, if the network is unavailable, the function correctly falls back to local cached templates as intended.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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  here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@Rocketknight1

[Rocketknight1]

We have a PR for this already! #39874

[laitifranz]

Thanks for pointing that out and for merging the fix recently! I’ll close this PR in favor of #39874