fix: fall back to exception class name when string is empty (#146)

[umran666]

Falls back to printing the exception's class name in main.py and model.py if the exception's string representation is empty, preventing empty parentheses like Failed () from being printed for exceptions without messages.

Closes #146.

[gemini-code-assist]

Code Review

This pull request improves error reporting in src/heretic/main.py and src/heretic/model.py by stripping whitespace from caught exception messages and falling back to the exception's class name if the string representation is empty. No review comments were provided, so there is no feedback to address.

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