Fix: Account for missing stdin / stdout when checking whether the runtime environment is interactive

[izeigerman]

Closes ##5498

[Copilot]

Pull Request Overview

This PR fixes a bug in the interactive environment detection by adding null checks for stdin and stdout before calling isatty() methods.

• Adds null checks for sys.stdin and sys.stdout before calling their isatty() methods
• Prevents potential AttributeError when stdin/stdout are None in certain runtime environments

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