Fix UnboundLocalError in _get when CurlError is raised

[Agnimandur]

Summary

• Fixes an UnboundLocalError in Api._get() when a curl_cffi.curl.CurlError is raised (e.g. Send failure: Broken pipe).
• The except block logged the error but fell through to code referencing resp, which was never assigned due to the exception. Added return None to exit early, consistent with the existing error-handling pattern for JSON decode failures.

Reproduction

2026-03-05 14:06:58.425 | ERROR    | truthbrush.api:_get:121 - Curl error: Failed to perform, curl: (55) Send failure: Broken pipe.
[14:07:00] cannot access local variable 'resp' where it is not associated with a value

Fix

Return None from the except CurlError block so execution doesn't fall through to self._check_ratelimit(resp) and resp.json() with an unbound variable.

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